P0801 — Shift/Timing Solenoid Low
Drive with caution — fix soon.
What P0801 means
This code means the control module detected a low voltage or low signal in the shift/timing solenoid circuit. It's typically caused by damaged or shorted wiring, corroded connectors, or a failing solenoid, and sometimes a control module fault. Repairs usually involve inspecting and repairing the circuit, cleaning connectors, or replacing the solenoid.
Common symptoms
- Check engine light is on
- Harsh, delayed, or erratic shifting
- Transmission may enter limp mode
- Slipping or inconsistent gear changes
- Reduced fuel economy in some cases
Common causes
- Short to ground or low voltage in the solenoid circuit
- Damaged or chafed wiring harness
- Corroded, loose, or dirty connectors
- Failing shift/timing solenoid
- Faulty transmission control module
Typical repair cost
$100 – $900
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0801 code?
Often yes in the short term, especially if the car still shifts normally. But because it's an electrical fault, it can cause erratic shifting or limp mode, so get it diagnosed soon rather than letting it linger.
How much does it cost to fix a P0801 code?
It's frequently on the lower side. Repairing wiring or cleaning connectors may cost relatively little, while replacing the solenoid can run a few hundred dollars depending on access and labor.
Is a P0801 code serious?
It's usually moderate. The car often drives, but an unaddressed circuit fault can lead to shifting problems or limp mode, so it's worth fixing before it gets worse.
What does 'solenoid low' mean in a P0801 code?
It means the voltage or signal in the solenoid circuit is lower than expected, often due to a short to ground or wiring damage. The fix usually involves checking the wiring and connectors before replacing parts.