PACCAR MX P1020 is the diagnostic trouble code documented on this 7 pages extract from the 2013 PACCAR MX Diagnostic Service Manual, published by PACCAR for EPA2013 MX engines. PACCAR prints the fault as “BPV actuator – Internal Error”, in the manual’s standard fault code layout.
Document details for PACCAR MX P1020
| 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 | P1020 — BPV actuator – Internal Error |
| Pages | 7 |
| File size | 0.5 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 comprehensive freeze frame type. The diagnostic runs continuously when the ignition is on.
- 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
The back pressure valve (BPV) actuator (L096) combines an actuator and a BPV valve that creates back pressure in the exhaust system and controls exhaust gas mass flow. Inside it are an ECU, an electromotor turning the output shaft through internal gears, position sensors on both the motor and the shaft, and a temperature sensor on the printed circuit board.
Set and reset conditions for PACCAR MX P1020
The code is set when the BPV actuator (L020) detects an internal error, and it changes to inactive after the ignition has been keyed off for at least 15 seconds and keyed on again with the error gone. The listed possible cause is a faulty BPV valve actuator. While the fault is active the actuator motor is switched off and engine torque is reduced. Repair verification cycles begin with the DAVIE Quick Check function.
Applies to EPA2013 MX engines
The PACCAR MX P1020 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 P1020 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 P1020 is in the DiagTechPro manuals library; a free account is required to download it.
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