Cause
Failed sensor reference voltage supply
The regulated five-volt supply a module provides to its sensors. One supply feeds several sensors, so losing it makes all of them report faults at once and none of them is faulty.
A spread of unrelated sensor codes is the signature, and replacing any of those sensors changes nothing.
Typically specialist work. Needs equipment or training most home workshops do not have.
Some of these codes mean you should stop driving
48 of the 398 codes this can cause indicate a fault where continuing to drive risks damage or is unsafe. Which one you have matters more than the cause does — read the code's own page before deciding.
Codes this can cause (398)
Codes where this is a likely explanation first, rather than merely a possible one.
- C05A4 Wheel Speed Sensors Supply Circuit Low Likely for this code High
- P0107 Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Low Likely for this code High
- P0122 Throttle/Pedal Position Sensor/Switch A Circuit Low Likely for this code Stop driving High
- P0192 Fuel Rail Pressure Sensor Circuit Low Bank 1 Likely for this code Stop driving High
- P0222 Throttle/Pedal Position Sensor/Switch B Circuit Low Likely for this code Stop driving High
- P0227 Throttle/Pedal Position Sensor/Switch C Circuit Low Likely for this code Stop driving High
- P0237 Turbocharger/Supercharger Boost Sensor A Circuit Low Likely for this code High
- P0241 Turbocharger/Supercharger Boost Sensor B Circuit Low Likely for this code High
- P0337 Crankshaft Position Sensor A Circuit Low Likely for this code Stop driving High
- P0342 Camshaft Position Sensor A Circuit Low Bank 1 or Single Sensor Likely for this code Stop driving High
- P0347 Camshaft Position Sensor A Circuit Low — Bank 2 Likely for this code Stop driving High
- P0367 Camshaft Position Sensor B Circuit Low — Bank 1 Likely for this code Stop driving High
- P0387 Crankshaft Position Sensor B Circuit Low Likely for this code Stop driving High
- P0392 Camshaft Position Sensor B Circuit Low — Bank 2 Likely for this code Stop driving High
- P0641 Sensor Reference Voltage A Circuit Open Likely for this code High
- P0642 Sensor Reference Voltage A Circuit Low Likely for this code High
- P0651 Sensor Reference Voltage B Circuit Open Likely for this code High
- P0652 Sensor Reference Voltage B Circuit Low Likely for this code High
- P0697 Sensor Reference Voltage C Circuit Open Likely for this code High
- P0698 Sensor Reference Voltage C Circuit Low Likely for this code High
- P0DFA Generator Phase U-V-W Current Sensor Correlation Likely for this code High
- P0ECA Hybrid/EV Battery Temperature Sensor System - Multiple Sensor Correlation Likely for this code High
- P0ECB Hybrid/EV Battery Voltage Sensor System - Multiple Sensor Correlation Likely for this code High
- P2135 Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation Likely for this code Stop driving High
- P2136 Throttle/Pedal Position Sensor/Switch A/C Voltage Correlation Likely for this code Stop driving High
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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