P0512
UniversalStarter Request Circuit
The starter request circuit carries the signal that a start has been requested. This code indicates that the vehicle's control system detected a problem related to that circuit; it does not by itself prove that the starter motor or any other part has failed. Depending on the cause, the vehicle may start normally, start intermittently, or fail to crank.
⚠️ Before You Begin (Safety First)
An unreliable starting system can leave the vehicle unable to restart. If the engine does not crank or starting becomes unpredictable, avoid relying on the vehicle until it has been checked. Keep the vehicle secured in Park or Neutral with the parking brake set during basic checks, and do not bypass starter controls or work on high-current wiring without the correct service information and precautions.
Common Symptoms
- The engine may not crank if the start request is not reaching or being recognized by the relevant control system.
- Starting may be intermittent if a connection or signal path works inconsistently.
- The vehicle may start normally and show no obvious symptoms if the fault is intermittent or does not prevent starting.
- A warning light or stored code may be present, depending on the vehicle.
Common Causes
- Damaged, loose, or corroded wiring or connectors in the starter request signal path.
- A fault in a switch or control that generates the start request, such as an ignition switch or start button where applicable.
- A problem in a relay or control module involved in passing or interpreting the request, depending on vehicle design.
- A poor connection or other circuit fault that causes the request signal to be lost or misread.
Diagnostic Steps
- Note whether the vehicle cranks and starts consistently, and record when the problem occurs; this helps identify whether the fault is intermittent.
- With the vehicle parked securely and the ignition off, visually inspect accessible starter-request wiring and connectors for obvious damage, looseness, or corrosion.
- Check the owner's manual for any relevant starting-system warnings or normal start procedure, and confirm the issue is not due to an incorrect start sequence.
- If the code returns or starting is unreliable, arrange diagnosis using vehicle-specific wiring information rather than replacing parts based on the code alone.
When to Call a Professional
Use model- and year-specific wiring information to trace the starter request signal. A technician can inspect connectors and wiring, use scan-tool data to see whether the start request is recognized, and test the circuit during a start request using the specified procedure. These checks help distinguish a signal-path problem from a separate starter or starting-system fault.
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Commonly Asked Questions
Does P0512 mean the starter motor is bad?
No. The code concerns the starter request circuit, which carries a request to start. The starter motor is one part of the broader starting system, and this code alone does not identify it as the cause.
Can a vehicle with P0512 still start?
Yes. It may start normally if the fault is intermittent or does not prevent the request signal from being recognized. Starting behavior depends on the vehicle and the underlying circuit condition.
What should be checked first?
Start with the symptoms and an inspection of accessible wiring and connectors. A technician can then check whether the start request is recognized in scan data and test the signal path using vehicle-specific procedures.
Is it safe to keep driving?
The code does not necessarily affect a running engine, but an unreliable starting system can prevent a restart. If the vehicle is failing to crank or starting inconsistently, have it checked before relying on it.
Browse Available Code Guides
Previous and next available guides in database record order, across makes. Adjacent entries may share a code number and do not necessarily describe related faults.