PACCAR MX P062A is the diagnostic trouble code documented on this 6 pages extract from the 2013 PACCAR MX Diagnostic Service Manual, published by PACCAR for EPA2013 MX engines. PACCAR prints the fault as “Common rail pump unit control – Too short at a certain rail pressure”, in the manual’s standard fault code layout.
Document details for PACCAR MX P062A
| Brand | PACCAR |
|---|---|
| Model coverage | PACCAR MX engines, EPA2013 emissions level |
| System / group | DTCs / MX Engines (EPA2013) |
| Source publication | 2013 PACCAR MX Diagnostic Service Manual |
| Fault code | P062A — Common rail pump unit control – Too short at a certain rail pressure |
| Pages | 6 |
| File size | 0.6 MB |
| Format | |
| Language | English |
Fault code summary and monitor data
The manual lists 1 trip MIL with 3 drive cycle recovery, no readiness group and a fuel freeze frame type. The diagnostic runs when the rail pressure control state is pump unit only.
- Code number
- Fault code description
- Fault code information
- Description of component(s)
- Set condition of fault code
- Reset condition of fault code
- Possible causes
- Diagnostic Step-by-Step
- Verification Drive Cycle
Component and system background
Common rail pump units 1 and 2 supply fuel to the common rail. The internal plunger is actuated by a roller lifter on the camshaft, and each pump has three pump events every two crankshaft revolutions. A pump event starts when the plunger travels up and the PCI ECU briefly activates the solenoid, closing the internal valve so fuel is pumped to the rail through a check valve.
Set and reset conditions for PACCAR MX P062A
The code is set when the PCI ECU (D420) detects that the common rail pump unit activation duration is lower than expected for a particular rail pressure for more than 4 seconds. It goes inactive when the fault is no longer detected. Listed causes are common rail pressure sensor deviation and common rail pump unit failure.
Applies to EPA2013 MX engines
The PACCAR MX P062A entry sits in the DTCs / MX Engines (EPA2013) section, so it applies to PACCAR MX engines built to that emissions level. Manufacturer product information is published on the PACCAR corporate website.
Who needs the PACCAR MX P062A fault code page
Technicians reading a live code, foremen writing an estimate and fleet managers deciding whether a truck stays in service all need the manufacturer wording rather than a generic code list.
The full PDF for MX P062A is in the DiagTechPro manuals library; a free account is required to download it.
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