The P0652 OBD-II code is a diagnostic trouble code that indicates a problem with the sensor reference voltage “B” circuit. This code is triggered when the engine control module (PCM) detects that the voltage level in this circuit is low, which can affect various engine sensors.
What Does the P0652 Code Mean?
OBD-II Code P0652 is defined as a Sensor Reference Voltage “B” Circuit Low. In this case, the PCM sends a 5-volt reference signal to all applicable engine sensors. If any of these sensors report a voltage lower than expected, the PCM will log the P0652 code.
What Causes the P0652 Code?
Several factors can trigger the P0652 code, including:
- Engine sensor failure
- Powertrain Control Module (PCM) failure
- Wiring issues
What Are the Symptoms of the P0652 Code?
The symptoms associated with the P0652 code can vary, but common signs include:
- Engine may not start
How Serious Is the P0652 Code?
The severity of the P0652 code is considered moderate. While it may not threaten the vehicle’s safety or functionality immediately, it is crucial to diagnose the issue within a reasonable time frame to prevent further complications and to ensure your vehicle remains in good working condition.
How to Diagnose the P0652 Code
Diagnosing the P0652 code requires a systematic approach:
- Use an OBD-II scanner to confirm the presence of the P0652 code.
- Inspect the wiring and connectors related to the sensor reference voltage “B” circuit for damage or corrosion.
- Test the voltage output of the PCM and the affected sensors.
- Check for other related trouble codes that may provide additional context.
Common Repairs for the P0652 Code
Common repairs for a P0652 code may include:
- Replacing faulty engine sensors
- Repairing or replacing damaged wiring or connectors
- Replacing the Powertrain Control Module (PCM) if necessary
How Much Does It Cost to Fix the P0652 Code?
The cost to fix the P0652 code can vary significantly based on the underlying cause. On average, repairs can range from $100 to $500, depending on whether you need to replace wiring, sensors, or the PCM itself.
Can I Fix the P0652 Code Myself?
If you have automotive repair experience and the right tools, you may be able to diagnose and fix the P0652 code yourself. However, due to the complexity of the electrical systems involved, it is often advisable to consult a professional mechanic for a thorough diagnosis and repair.
