Truck Won't Start? No-Crank or Crank-No-Start
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Quick answer: First establish whether the engine actually rotates. No rotation is a no-crank complaint; rotation without the engine running is crank-no-start. Keep slow cranking and an engine that starts then stalls as separate observations. Record whether it occurs hot, cold or after sitting. Save the installed-engine identity, warnings, available fault report and recent work, then choose the matching guide below. These observations do not identify a failed starter, fuel pump or injector.
Application: General commercial-truck symptom routing. Delco Remy June 2023 and DENSO April 2022 supply starting-system context; Mack April 2023 supplies separately scoped protection/shutdown examples. Linked engine guides retain their own generation, serial, chassis and dated-source limits. This page supplies no voltage, speed, pressure, cranking-duration, priming or component-replacement procedure.
What does will not start mean in this report?
Describe the event already observed: silence, clicking, slow engine rotation, normal-looking rotation without running, or an engine that runs and then stops. If the behavior is uncertain, say unknown. Do not create repeated start attempts or approach moving equipment just to complete a description.
DENSO explains that the starter provides the engine's initial rotation. Delco Remy separately names slow crank, click/no-crank and no-click/no-crank. Preserve that distinction rather than turning every will-not-start report into the same complaint. [1] [2]
| Observed event | Describe it as | Useful next record |
|---|---|---|
| Engine does not rotate | No-crank; note click or no click if known. | Existing sounds/messages, recent work and chassis/starting-system identity. |
| Engine rotates slowly | Slow crank. | Conditions and the completed battery, cable and starter/engine assessment. |
| Engine rotates but does not run | Crank-no-start. | Installed engine, full fault report and the matched engine diagnostic. |
| Engine runs then stops | Starts and stalls. | Time/conditions before stopping, warnings and relevant service history. |
What should be saved before codes are cleared or parts are removed?
Keep VIN, truck model/build, installed-engine model and full serial, emissions/generation record, and any replacement-engine or conversion history. Use readable label photographs obtained safely. A truck model or broad engine-family name alone does not establish the current diagnostic application.
For Cummins, the Parts Information page directs readers to the engine dataplate/ESN and engine-identification/manual resources. Use the corresponding current manufacturer information for the engine actually installed. [3]
Retain the complete available fault report, including manufacturer code or SPN/FMI, status, related faults and recorded conditions. Note hot/cold behavior, whether it is intermittent, whether a shutdown warning appeared, and recent fuel-filter, battery, cable, starter or engine work. Keep a no-communication finding distinct from a conclusion that a control module failed.
Use existing records and the provider's findings. If no report is available, mark it unavailable and ask the service provider how to obtain the correct assessment. A code description or the timing of a recent repair does not by itself confirm the failed component.
Where should no-crank and slow-crank complaints go?
Use the battery, cable and starter evidence guide for the distinctions to retain with the shop's completed assessment. Keep battery condition, external electrical paths, control/permission and starter or engine findings separate. A click is an observation, not a component diagnosis.
The April 2023 Mack instructions describe starter engagement being inhibited under specified protection or vehicle conditions on some systems. That is a scoped example of why current chassis and transmission information matters. It does not authorize bypassing an interlock or applying Mack's starting sequence to another truck. [4]
If a no-crank complaint changes to cranking without starting, update the report. The next diagnostic branch should follow the current event rather than remain fixed on the first suspected part.
What changes when the engine turns but does not run?
Choose the installed engine's guide and read its application section before using any technical example. Keep the engine-control, electrical and fuel findings required by the matching diagnostic together; this router does not supply a universal test order or pressure target.
A problem after fuel-filter service needs that service history, filter/housing identity and the relevant provider findings. It does not justify transferring a priming method from a different engine or filter system. For a recent filter-service complaint, the general fuel-filter-service evidence guide supplies a separate starting point; use its scope and the actual engine instructions.
Why is starting difficult only hot, cold or after sitting?
A temperature or parking pattern identifies when the problem appears; it does not identify one failed part. First retain the actual event: no rotation, slow rotation, cranking without running, or starting then stalling. Keep the pattern beside that event so a cold slow-crank complaint does not become the same report as a hot engine that rotates normally but will not run.
Cold only: record ambient conditions, how long the engine sat, the observed rotation and any heater/warning indications already recorded. DENSO's April 2022 overview describes cold-condition engine drag as relevant to rotation. Cummins' fuel-contaminant overview separately discusses temperature-dependent fuel composition and water/wax context. These are different areas for a matched assessment, not proof that a cold-only complaint requires a battery, additive or fuel-system part. [2] [5]
Hot only: retain the operating state before shutdown, time before the attempted restart, messages and whether the engine rotates normally. Ask the provider to assess the actual condition using the installed engine's instructions. The directory includes separately scoped DT466E hot-start and C7 hot-start guides; their examples do not identify the same cause on other engines.
After sitting: record the parking interval, whether the previous shutdown was normal, recent filter/fuel-system service, and any existing leak or fuel-supply findings. Ask what the completed assessment establishes before calling it loss of prime or a leak-back problem. Use the relevant engine guide below; a parking interval alone does not confirm a failed pump, seal or check valve.
Keep a comparison with the truck's usual starting behavior where that record exists, and mark missing details unknown. Do not repeat starts, disconnect components, change oil/fuel treatment or copy another engine's priming steps just to reproduce a pattern. Current engine, chassis and fuel requirements control the next assessment.
Which existing engine guide should I read?
These links point to published starting-related guides, not interchangeable procedures. Some cover a specific hot-start, filter-service, control-system or fuel-hardware example. Confirm that its application matches before proceeding; a family appearing in this directory does not extend a dated bulletin to every generation.
Detroit Diesel
- DD15 No Start After a Fuel-Filter Change: Checks Before Parts
- DD13 Losing Prime or Cranking Without Starting: What to Check
- Diesel Fuel Pressure Problems: Supply, Pump, Valve or Sensor?
- Series 60 Losing Prime or Hard to Start: Evidence Before Parts
Cummins
- Cummins ISX Fuel Systems and No-Start Checks Before Parts
- Cummins N14 Hard Starting or Losing Prime: What to Check
- Cummins ISM/M11 Starting and Fuel Checks Before Buying Parts
- Cummins ISB 6.7 Cranks but Will Not Start: Checks Before Parts
- Cummins ISL/L9 Hard Starting or Losing Prime: What to Check
PACCAR
- PACCAR MX-13 Cranks but Won't Start: Fuel Checks Before Parts
- PACCAR MX-11 Cranks but Won't Start: Evidence Before Parts
International
- MaxxForce 11/13 Starting: No-Start and Cold-Start Checks
- International A26 Cranks but Will Not Start: Checks Before Parts
- DT466E Hot Start, ICP and Injector Checks: 2001 System
- Mechanical DT466 Starting and Injection Pump: Bosch MW Example
- MaxxForce DT No-Start and Injector Checks: EPA2007 Evidence
Caterpillar
- CAT C13 Will Not Start: KCB No-Crank and Crank-No-Start Checks
- CAT C12 Hard Starting or Losing Prime: Checks Before Parts
- CAT 3406E Hard Starting: Fuel-Prime Checks Before Parts
- Cat C7 Hot No-Start: Injector and Actuation Checks
- Cat C9 Cranks but Will Not Start: Identify the Fuel System
Volvo
- Volvo D11/D13 Cranks but Will Not Start: Fuel-Pressure Evidence
- Volvo D16 Cranks but Will Not Start: D16F Fuel Evidence
Mack
Commercial Ford
If the installed engine is not listed, or the linked example does not match its generation or chassis, use the Garage engine selector for identification resources and request current manufacturer information from the service provider. Do not substitute a similar engine's diagnostic. The directory does not imply that every planned technical topic is complete.
When should further starting attempts stop?
Follow the actual vehicle's warning display and operator instructions. If the situation is unsafe, the engine appears blocked, or a leak, smoke or unusual mechanical condition needs assessment, stop attempting to start it and arrange qualified help. Keep the exact warning and event with the service request.
Mack's April 2023 instructions warn that repeatedly restarting after its engine shutdown system activates can cause severe engine damage. Preserve a STOP/shutdown warning as a separate condition, not an ordinary crank-no-start prompt to keep retrying. This scoped example supplies no restart permission or timing for other trucks. [4]
This page provides no starting-fluid, jumper, interlock-bypass, fuel-line opening or manual engine-turning procedure. Have the provider use the matching current information to decide whether and how another attempt or test is appropriate.
What belongs in the parts request after the fault is confirmed?
Send the installed identity, full component markings, accessible photographs and the provider's completed diagnostic conclusion. Ask which exact service item, included components and required setup address the finding. Keep a starter, fuel-supply, injector, wiring or control-module conclusion tied to its supporting evidence rather than the generic no-start description.
Keep the repair and final complaint-verification record with the original report. No ATP product application or inventory is established by this routing guide. The parts RFQ worksheet can hold the confirmed identification and scope once that decision is made.
Common truck starting questions
Is no-crank the same as crank-no-start?
No-crank means the engine does not rotate. Crank-no-start means it rotates without running. Report slow rotation and starts-then-stalls separately.
Does clicking identify a failed starter?
No. Retain the actual observation and the completed chassis/starting-system assessment.
Does cranking without starting prove a fuel pump is bad?
No. Use the matching engine diagnostic and retain the completed findings that support the named repair.
Can I use another generation's pressure or priming steps?
The directory does not authorize that transfer. Read the linked application section and obtain current matching instructions.
What if I cannot identify the engine or obtain codes?
Mark missing information unknown, retain the records available, and ask the provider for the correct identification and assessment.
Should I keep restarting after a STOP or shutdown warning?
Follow the actual operator instructions and obtain the appropriate assessment. The Mack example warns against repeated restarts after shutdown activation; this page supplies no restart permission.
Does a cold-only hard start prove the batteries or fuel are faulty?
No. Preserve the actual rotation, conditions and completed battery/engine/fuel findings required by the matching assessment.
Does hard starting after sitting prove fuel is leaking back?
The parking interval is a condition to report. Keep the applicable completed findings before naming loss of prime, a leak or a failed component.
Manufacturer sources and application limits
Dated examples explain the decision and its limits. Use current service information for the actual vehicle, installed engine and starting-system configuration. No universal test threshold or replacement authorization is supplied here.
- Delco Remy CONNECT, June 2023, Tech Tip: Diagnosing Starter Cranking Problems, pages 2-3. Slow-crank, click/no-crank and no-click/no-crank categories only; no universal electrical limit, fault-to-part rule or diagnostic sequence transferred.
- DENSO Aftermarket Europe, Starter troubleshooting, April 27, 2022. General starter function and separate electrical/mechanical assessment context. Its numerical voltage, speed and current examples are not all-truck specifications.
- Cummins, Parts Information, undated public page checked November 5, 2026. Engine-dataplate/ESN and matching-manual lookup context only; no individual diagnosis, part fitment or stock verified.
- Mack Body Builder Instructions, USA172219549, April 2023, introduction and printed pages 2-3; MP7/MP8/MP10 and listed chassis scope. Starter-protection and STOP/shutdown cautions are scoped examples. No universal cranking interval, restart permission, bypass or starting-aid procedure supplied.
- Cummins, Diesel Fuel Contaminants, undated public overview checked November 5, 2026. Water/wax and weather-dependent fuel context only. No shelf-life rule, additive recommendation, blending threshold, cold-start diagnosis or truck-specific fuel procedure transferred.
Send the confirmed component request
Use the fitment verification form with the vehicle and installed-engine identities, complete markings, installed position, diagnostic finding and accessible photographs. Part fitment, package contents and availability require confirmation.
Related guide: Slow Cranking: Battery, Cables or Starter?.
