This document is a PACCAR P1335A crankshaft sensor diagnostic reference for truck mechanics servicing MX-series EPA-regulated engines. Published by PACCAR on 17 August 2017, it provides diagnostic conditions, set conditions, and repair verification steps for DTC P1335A activation in the PCI ECU (D420) control module.
The PACCAR P1335A code triggers when the engine control unit detects that one or more holes in the flywheel are not detected within a single crankshaft revolution, indicating potential sensor or mechanical faults requiring immediate diagnostic attention.
Document details and specifications — PACCAR P1335A crankshaft
| Brand | PACCAR |
| Model coverage | Trucks with MX EPA engines |
| System/Group | DTCs / MX Europe Engines (EPA 2004) |
| Publication number | M033296 |
| Year/Revision | 17 August 2017 |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Table of contents
- Set conditions: PCI ECU (D420) flywheel hole detection failure
- Diagnostic condition: continuous monitoring when engine starts
- Corresponding OBD readiness monitor
- Reset condition: DTC inactivation when fault clears
- Repair verification procedure with three-step test drive protocol
- Possible causes: crankshaft sensor signal faults, damaged flywheel, faulty crankshaft sensor
- Additional information: crankshaft sensor (F552) function and camshaft sensor (F558) backup role
Applies to these models
This PACCAR P1335A diagnostic reference applies to PACCAR trucks equipped with MX-series EPA 2004 and EPA 2013 compliant engines. The code specifically relates to crankshaft speed and position sensing via the F552 crankshaft sensor, with F558 camshaft sensor backup capability. Consult PACCAR’s official site for engine-specific variations and chassis number applicability.
Who needs this PACCAR P1335A crankshaft sensor manual
Diesel mechanics and workshop owners diagnosing PACCAR MX-engine trucks with active or stored P1335A codes need this reference. The guide supports efficient fault isolation between electrical sensor faults and mechanical flywheel damage, reducing diagnostic time and enabling faster repair decisions.
The complete PACCAR P1335A diagnostic PDF is available in the DiagTechPro manuals library; a free account is required to download this technical reference.
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