Sensor Reference Voltage D Circuit Range or Performance
The 5-volt sensor reference rail D is electrically connected but its voltage is out of tolerance — drifting, sagging under load, or noisy instead of a stable 5.00 V. Every sensor fed from reference D then reports skewed readings, which can trigger secondary faults. Causes: a partial short or high resistance on the reference-D circuit, an overloaded rail caused by a shorted sensor, or an internal regulator fault in the module.
Affected components
- Sensor reference voltage d
Common causes
- High likelihood: Reference rail drifted
Possible symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.