What does P1810 mean on a Chevy?

P1810. Transmission Fluid Pressure Manual Valve Position Switch Circuit. Applies to Silverado, Sierra, Tahoe, Yukon, Impala, Malibu.

What causes P1810 on a Chevy?

Faulty TFP manual valve position switch assembly on the valve body Open or short in the TFP switch signal circuits Corroded AT inline 20-way connector Internal transmission harness shorted together or to ground Low or contaminated transmission fluid skewing switch readings

How do I fix P1810 on a Chevy?

Compare scan tool TFP switch range against the shifter position with a Tech2 scan tool Disconnect the AT inline connector and verify all TFP signals read HI Jumper each TFP signal to ground and confirm the scan tool reads LOW Test signal circuits for opens, shorts to ground, and shorts between circuits Replace the TFP switch assembly if circuits test normal, then clear and verify

Code

P1810

Transmission Fluid Pressure Manual Valve Position Switch Circuit

Category: Powertrain - Transmission
Severity: Check Engine Light
Applies to: Silverado, Sierra, Tahoe, Yukon, Impala, Malibu
Related: No single generic twin. See OBD Codes List

What it means

P1810. Transmission Fluid Pressure Manual Valve Position Switch Circuit. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Yukon, Impala, Malibu.

Findings, check these first

Faulty TFP manual valve position switch assembly on the valve body
Open or short in the TFP switch signal circuits
Corroded AT inline 20-way connector
Internal transmission harness shorted together or to ground
Low or contaminated transmission fluid skewing switch readings

Standard procedure

Compare scan tool TFP switch range against the shifter position with a Tech2 scan tool
Disconnect the AT inline connector and verify all TFP signals read HI
Jumper each TFP signal to ground and confirm the scan tool reads LOW
Test signal circuits for opens, shorts to ground, and shorts between circuits
Replace the TFP switch assembly if circuits test normal, then clear and verify

Look up another code

Press / to jump to the box. Chevy-enhanced powertrain, body, chassis and network codes.

Sources and review

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Last updated 2026-09-13.

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