What does P1887 mean on a Chevy?

P1887. TCC Release Switch Circuit. Applies to Impala, Malibu, Monte Carlo, Lumina, Grand Prix-era GM.

What causes P1887 on a Chevy?

Faulty TCC release pressure switch in the TFP switch assembly Open in the TCC release switch signal circuit between PCM and transmission Residual TCC release pressure from pump or turbine shaft cross leaks Sticking TCC control valve or worn valve body bore Leaking number 1 checkball in the channel plate

How do I fix P1887 on a Chevy?

Monitor TCC release switch state versus TCC slip with a Tech2 scan tool Test the release switch signal circuit for an open between PCM and transmission Check voltage at the transmission harness terminal with key on engine off Inspect turbine shaft seals, pump bushing, and TCC control valve for wear Replace the TFP switch assembly or repair hydraulic leaks as testing directs

Code

P1887

TCC Release Switch Circuit

Category: Powertrain - Transmission
Severity: Check Engine Light
Applies to: Impala, Malibu, Monte Carlo, Lumina, Grand Prix-era GM
Related: No single generic twin. See OBD Codes List

What it means

P1887. TCC Release Switch Circuit. This Chevy-enhanced code applies to Impala, Malibu, Monte Carlo, Lumina, Grand Prix-era GM.

Findings, check these first

Faulty TCC release pressure switch in the TFP switch assembly
Open in the TCC release switch signal circuit between PCM and transmission
Residual TCC release pressure from pump or turbine shaft cross leaks
Sticking TCC control valve or worn valve body bore
Leaking number 1 checkball in the channel plate

Standard procedure

Monitor TCC release switch state versus TCC slip with a Tech2 scan tool
Test the release switch signal circuit for an open between PCM and transmission
Check voltage at the transmission harness terminal with key on engine off
Inspect turbine shaft seals, pump bushing, and TCC control valve for wear
Replace the TFP switch assembly or repair hydraulic leaks as testing directs

Look up another code

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Sources and review

Review: no source links are recorded for this entry.

Last updated 2026-09-13.

Report a correction for P1887. Include your vehicle, the issue and a source if you have one.