What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer communications
6Original wording in English
VOLVO
Reported code forms P1021-11
Engine Brake - Diagnostic Trouble Code (DTC) P1021-11 Volvo Compression Brake (VCB) Control Circuit Short To Ground - US17+OBD16 Through US17+OBD19 Emissions, Model Years 2018 To 2020
VOLVO
Reported code forms P1021-11
Engine Brake - Diagnostic Trouble Code (DTC) P1021-11 Volvo Compression Brake (VCB) Control Circuit Short To Ground - US17+OBD16 Through US17+OBD19 Emissions, Model Years 2018 To 2020
MACK
Reported code forms P1021-11
Engine Brake - Diagnostic Trouble Code (DTC) P1021-11 Volvo Compression Brake (VCB) Control Circuit Short To Ground - US17+OBD16 Through US17+OBD19 Emissions, Model Years 2018 To 2020
HONDA
Reported code forms P1021
PRODUCT UPDATE: ECM UPDATE TO PREVENT CATALYST DTC P0420 AND/OR VPS DTC P1021, MCM UPDATE TO CURRENT SPECIFICATIONS. *TT
HONDA
Reported code forms P1021
DIAGNOSTIC TROUBLE CODE P1021 SETS AFTER OIL CHANGE. *TT
HONDA
Reported code forms P1021
DIAGNOSTIC TROUBLE CODE P1021 AFTER AN OIL CHANGE. *TT
Check vehicle applicability
46A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Honda | CIVIC | 2005 |
| Honda | CIVIC | 2004 |
| Honda | CIVIC | 2003 |
| Mack | ANTHEM (AN) | 2020 |
| Mack | ANTHEM (AN) | 2019 |
| Mack | ANTHEM (AN) | 2018 |
| Mack | CHU | 2018 |
| Mack | CXU | 2018 |
| Mack | GRANITE (GR) | 2020 |
| Mack | GRANITE (GR) | 2019 |
| Mack | GRANITE (GR) | 2018 |
| Mack | GRANITE (GU) | 2020 |
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.