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OBD Codes
Your OBD-II Trouble Codes Repair Site

P081B Starter Disable Circuit High

OBD-II Trouble Code Technical Description

Article by
Stephen Darby
Stephen Darby
ASE Certified Technician

总裁俱乐部appStarter Disable Circuit High

What does that mean?

总裁俱乐部appThis diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). That may include but is not limited to vehicles from Subaru, BMW, Mazda, Volkswagen, Audi, etc. Although generic, the exact repair steps may vary depending on year, make, model and powertrain configuration.


 

总裁俱乐部appIf your vehicle has stored a code P081B, it means that the powertrain control module (PCM) has detected a degree of voltage that is lower than expected in the starter disable switch circuit. This type of code may be applicable to vehicles with manual or automatic transmissions.

总裁俱乐部appThe starter disable switch is usually a single circuit, open/closed switch which interrupts voltage between the ignition switch and the starter solenoid if the clutch is not depressed, the transmission (manual) is not in neutral, or the transmission (automatic) is not in park. Vehicle applications with an automatic transmission may have the starter disable switch integrated into the neutral safety switch or shift selector switch. The transmission control module (TCM) or the PCM monitor starter disable circuit voltage with the ignition in the ON position. The TCM may be a stand alone module or part of the PCM.

总裁俱乐部appIf the PCM detects that starter disable switch circuit voltage is not within allowable parameters, a code P081B may be stored and a malfunction indicator lamp (MIL) illuminated. Multiple ignition cycles (with a failure) may be required for MIL illumination.


P081B

What is the severity of this DTC?

总裁俱乐部appA stored code P081B could be accompanied by a no-start condition and also indicates that either an electrical issue or a mechanical failure has occurred. Conditions which contributed to a code of this nature being stored should be rectified as quickly as possible.

What are some of the symptoms of the code?

Symptoms of a P081B trouble code may include:

What are some of the common causes of the code?

总裁俱乐部appCauses for this code may include:

What are some P081B troubleshooting steps?

总裁俱乐部appA diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of vehicle specific diagnostic information will be required to diagnose a code P081B.

You may use your source of vehicle information to locate a technical service bulletin (TSB) that matches the vehicle year, make, and model; as well as the engine size, code/s stored, and symptoms exhibited. If you find one, it could yield helpful diagnostic information.

总裁俱乐部appUse the scanner (connected to the vehicle diagnostic connector) to retrieve all stored codes and pertinent freeze frame data. It is a good idea to write this information down before clearing the codes then test-drive the vehicle until the PCM either enters readiness mode or the code is reset.

总裁俱乐部appIf the PCM enters readiness mode at this time, the code is intermittent and may be much more difficult to diagnose. If this is the case, the conditions which contributed to the code being stored may need to worsen before an accurate diagnosis can be made.

If the code is immediately reset, the next step of your diagnosis will require that you search your vehicle information source for diagnostic flow-charts, connector pin-out charts, connector face views, and component testing procedures/specifications.

Step 1

总裁俱乐部appUse the DVOM to test voltage, ground, and signal output at the appropriate starter disable switch. Typical starter disable switch circuits consist of either battery voltage (when activated) or ground (when deactivated).

Step 2

总裁俱乐部appUse your source of vehicle diagnostic information and the DVOM to test starter disable switches as required. Replace switches that do not test within system parameters.

Step 3

总裁俱乐部appIf system switches and circuits are functional, use the DVOM to test starter disable switch circuits to the starter, as well as to the PCM. Disconnect all controllers prior to using the DVOM for testing.

Related DTC Discussions

Need more help with a P081B code?

If you still need help regarding the P081B trouble code, please post your question in our FREE car repair forums.

总裁俱乐部appNOTE: This information is presented for information purposes only. It is not intended as repair advice and we are not responsible for any actions you take on any vehicle. All information on this site is copyright protected.

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