PACCAR MX P102A is the diagnostic trouble code documented on this 4 pages extract from the 2013 PACCAR MX Diagnostic Service Manual, published by PACCAR for EPA2013 MX engines. PACCAR prints the fault as “Temperature after BPV – Voltage too high or short circuit to supply on ECU D420 pin C11”, in the manual’s standard fault code layout.
Document details for PACCAR MX P102A
| 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 | P102A — Temperature after BPV – Voltage too high or short circuit to supply on ECU D420 pin C11 |
| Pages | 4 |
| File size | 0.4 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 generic freeze frame type. Diagnostic condition information is not available for this entry.
- 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
Exhaust gas temperature after the back pressure valve is measured by sensor F853 and reaches the PCI ECU (D420) on pin C11, with ground on pin C33. The reading is used to calculate the NOx composition for correction of engine NOx emissions and to calculate the temperature before the turbine, so a higher measured value pushes both calculations up.
Set and reset conditions for PACCAR MX P102A
The code is set when sensor output voltage is greater than 4.343 V, and it changes to inactive immediately after the diagnostic runs. No possible causes and no additional information are printed for this code. The component check for sensor F853 is done with the ignition off and the connector disconnected, measuring 197.6 to 204.6 ohms between pins 1 and 3. Validation is two minutes at idle with the brakes set.
Applies to EPA2013 MX engines
The PACCAR MX P102A 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 P102A 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 P102A is in the DiagTechPro manuals library; a free account is required to download it.
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