TFP Valve Position Switch Circuit
2001-2001 Cadillac DeVille 4.6L V8 Northstar
The 2001 Cadillac DeVille is equipped with a 4.6L V8 engine. Below you'll find detailed p1810 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The PCM/TCM detected a fault in the Transmission Fluid Pressure (TFP) manual valve position switch circuit. This switch tells the TCM what gear range the driver has selected.
Symptoms
- Check Engine Light
- Transmission stuck in one gear
- Incorrect gear selection display
- Harsh shifting
- No reverse
Common Causes
- Faulty TFP switch (internal to transmission)
- Wiring issue to TFP switch
- Transmission connector damage
- TCM failure
- Low transmission fluid affecting pressure switch
Diagnostic Steps
- Check transmission fluid level and condition
- Read TFP switch data with scan tool
- Test TFP switch circuit resistance
- Inspect transmission connector
- Compare commanded gear to actual gear
Repair Notes
Check fluid level first. TFP switch is internal to the transmission and requires pan removal to access. Replace switch or repair connector.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1810 on Other Vehicles
Common Questions
What does code P1810 mean on a 2001-2001 Cadillac DeVille?
P1810 stands for "TFP Valve Position Switch Circuit". The PCM/TCM detected a fault in the Transmission Fluid Pressure (TFP) manual valve position switch circuit. This switch tells the TCM what gear range the driver has selected.
What are the symptoms of P1810 on a Cadillac DeVille?
Common symptoms of P1810 include: Check Engine Light, Transmission stuck in one gear, Incorrect gear selection display, Harsh shifting, No reverse.
What causes P1810 on a 2001-2001 Cadillac DeVille?
Common causes of P1810 include: Faulty TFP switch (internal to transmission), Wiring issue to TFP switch, Transmission connector damage, TCM failure, Low transmission fluid affecting pressure switch.
Last updated: March 2026