PowertrainP1238
CautionSeverity: Caution - get it checked when you can
Boost pressure sensor circuit voltage high intermittently
Key terms: Boost pressure: extra air pressure made by a turbo or supercharger · Control module: a small computer that runs one part of the car · Powertrain: engine, transmission and emissions
1What it means in plain English
The engine or powertrain control system has stored a fault that does not have specific guidance in this database yet.
2Common causes
- Sensor or actuator fault
- Wiring or connector fault
- Vacuum or intake leak
- Fuel or ignition problem
- Control module fault
3Can I drive?
Have it diagnosed promptly. If the car runs and drives normally, drive gently to a workshop. If it runs badly, stalls, overheats, loses oil pressure, or a warning light is flashing or red, stop safely and get professional help. If the code concerns the brakes, brake vacuum or brake assist, do not drive until it is checked: a hard pedal or longer stopping distance means stop.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 32
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P1238 | region Brand | Powertrain |
| BYD | P1238 | AFS plausibility Brand | Powertrain |
| Chery | P1238 | AFS plausibility Brand | Powertrain |
| Daewoo | P1238 | VSV 3 Circuit Brand | Powertrain |
| Daihatsu | P1238 | Injector injection abnormal Brand | Powertrain |
| DFFS | P1238 | Boost pressure sensor circuit voltage high intermittently Brand | Powertrain |
| DFFX | P1238 | AFS plausibility Brand | Powertrain |
| DFXK | P1238 | Fuel Injector for Cylinder 2 (N31): Open Circuit Brand | Powertrain |
| EOBD | P1238 | Luftmenge Brand | Powertrain |
| Geely | P1238 | AFS plausibility Brand | Powertrain |
| GM | P1238 | No description available | Powertrain |
| Great Wall | P1238 | AFS plausibility Brand | Powertrain |
| Hafei | P1238 | AFS plausibility Brand | Powertrain |
| Honda | P1238 | No description available | Powertrain |
| Hyundai | P1238 | No description available | Powertrain |
| Land Rover | P1238 | No description available | Powertrain |
| Mahindra | P1238 | No description available | Powertrain |
| Maserati | P1238 | No description available | Powertrain |
| Mitsubishi | P1238 | MAP/AFS plausibility Brand | Powertrain |
| Nissan | P1238 | No description available | Powertrain |
| Perodua | P1238 | Injector injection abnormal Brand | Powertrain |
| Peugeot | P1238 | No description available | Powertrain |
| Porsche | P1238 | No description available | Powertrain |
| Proton | P1238 | MAP/AFS plausibility Brand | Powertrain |
| Renault | P1238 | No description available | Powertrain |
| Saab | P1238 | VSV 3 Circuit Brand | Powertrain |
| MG (SAIC) | P1238 | Turbocharger Boost Sensor Too Low Engine Stopped Brand | Powertrain |
| Subaru | P1238 | Exhaust Control Valve Solenoid Circuit High Brand | Powertrain |
| Suzuki | P1238 | ETC ACTR-B2 Brand | Powertrain |
| Tata | P1238 | Boost Pressure Signal High Brand | Powertrain |
| Toyota | P1238 | Boost pressure sensor circuit voltage high intermittently Brand | Powertrain |
| Volkswagen | P1238 | Fuel Injector for Cylinder 2 (N31): Open Circuit Brand | Powertrain |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Extended variant codes 1
These 7-character codes are manufacturer-specific variants of P1238 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| SsangYong | P123864 | Safety: motor speed error Brand | Powertrain |
6Related codes
Browse Pxxx codes or P123xx codes.