5 Volt Reference 2 Circuit
2015-2015 Chevrolet Spark EV Electric Motor 🇩🇪
Description
The PCM detected that the 5-volt reference B circuit voltage is out of tolerance. This is a separate 5V reference circuit from P1635 and feeds a different set of sensors.
Symptoms
- Check Engine Light
- Engine stalling
- Multiple sensor DTCs
- Poor drivability
- Loss of power
Common Causes
- Short to ground in a connected sensor circuit
- Damaged sensor wiring
- Faulty sensor on this reference
- PCM 5V reference driver failure
Diagnostic Steps
- Measure 5V reference 2 voltage
- Disconnect sensors one at a time on this circuit
- Inspect wiring for shorts
- Test PCM output
Repair Notes
Same diagnostic approach as P1635. Disconnect sensors one at a time to isolate the shorted circuit.
Related Codes
Other Powertrain Codes
- P0070Ambient Air Temperature Sensor Circuit
- P0071Ambient Air Temperature Sensor Range/Performance
- P0072Ambient Air Temperature Sensor Circuit Low
- P0073Ambient Air Temperature Sensor Circuit High
- P0115Engine Coolant Temperature (ECT) Sensor 1 Circuit
- P0116ECT Sensor 1 Circuit Range/Performance
- P0117ECT Sensor 1 Circuit Low Input
- P0118ECT Sensor 1 Circuit High Input
- P0119ECT Sensor 1 Circuit Intermittent
- P0125Insufficient Coolant Temperature for Closed Loop Fuel Control
P1639 on Other Vehicles
Chevrolet Astro
1996-1996 4.3L V6 Vortec
Chevrolet Astro
1997-1997 4.3L V6 Vortec
Chevrolet Astro
1998-1998 4.3L V6 Vortec
Chevrolet Astro
1999-1999 4.3L V6 Vortec
Chevrolet Astro
2000-2000 4.3L V6 Vortec
Chevrolet Astro
2001-2001 4.3L V6 Vortec
Chevrolet Astro
2002-2002 4.3L V6 Vortec
Chevrolet Astro
2003-2003 4.3L V6 Vortec
Common Questions
What does code P1639 mean on a 2015-2015 Chevrolet Spark EV?
P1639 stands for "5 Volt Reference 2 Circuit". The PCM detected that the 5-volt reference B circuit voltage is out of tolerance. This is a separate 5V reference circuit from P1635 and feeds a different set of sensors.
What are the symptoms of P1639 on a Chevrolet Spark EV?
Common symptoms of P1639 include: Check Engine Light, Engine stalling, Multiple sensor DTCs, Poor drivability, Loss of power.
What causes P1639 on a 2015-2015 Chevrolet Spark EV?
Common causes of P1639 include: Short to ground in a connected sensor circuit, Damaged sensor wiring, Faulty sensor on this reference, PCM 5V reference driver failure.
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