What does P1842 mean on a Chevy?

P1842. 1-2 Shift Solenoid Circuit Low Voltage. Applies to Impala, Malibu, Monte Carlo, Lumina, Venture.

What causes P1842 on a Chevy?

Faulty 1-2 shift solenoid valve Short to ground in the 1-2 shift solenoid control circuit Corroded AT inline 20-way connector Internal transmission harness shorted to ground Faulty powertrain control module driver

How do I fix P1842 on a Chevy?

Command the 1-2 shift solenoid on and off with a Tech2 scan tool Measure solenoid resistance and compare to GM specification Test the control circuit for a short to ground between PCM and transmission Inspect the internal harness and AT inline connector Replace the shift solenoid if circuits test normal, then clear and road test

Code

P1842

1-2 Shift Solenoid Circuit Low Voltage

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

What it means

P1842. 1-2 Shift Solenoid Circuit Low Voltage. This Chevy-enhanced code applies to Impala, Malibu, Monte Carlo, Lumina, Venture.

Findings, check these first

Faulty 1-2 shift solenoid valve
Short to ground in the 1-2 shift solenoid control circuit
Corroded AT inline 20-way connector
Internal transmission harness shorted to ground
Faulty powertrain control module driver

Standard procedure

Command the 1-2 shift solenoid on and off with a Tech2 scan tool
Measure solenoid resistance and compare to GM specification
Test the control circuit for a short to ground between PCM and transmission
Inspect the internal harness and AT inline connector
Replace the shift solenoid if circuits test normal, then clear and road test

Look up another code

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Sources and review

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Last updated 2026-09-13.

Report a correction for P1842. Include your vehicle, the issue and a source if you have one.