OBD Guide
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P1842

1-2 Shift Solenoid Circuit Low Input Voltage

P1842 is an OBD-II diagnostic trouble code meaning: 1-2 Shift Solenoid Circuit Low Input Voltage. Common causes: shift solenoid 1-2 malfunction, open or short circuit in the circuit. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Incorrect gear shifting
  • Delays when switching from 1st to 2nd gear
  • Power dips during acceleration
  • Increased fuel consumption
  • Check Engine light comes on

Causes

  • Shift Solenoid 1-2 Malfunction
  • Open or short circuit in the circuit
  • Bad contacts in connectors
  • Transmission control module (TCM) malfunction
  • Problems with power or grounding of the circuit

How to Fix

  1. Check the integrity of wiring and connectors
  2. Check solenoid resistance
  3. Check voltage in solenoid circuit
  4. Replace faulty solenoid if necessary
  5. Check and, if necessary, replace the transmission control unit

Related codes

P1841P1843P1844

Error P1842 by Vehicle Brand

BuickCadillacChevroletGMGMCOldsmobileSaturnVolkswagen

FAQ

What does the P1842 code mean?

P1842 is an OBD-II diagnostic trouble code that indicates: 1-2 Shift Solenoid Circuit Low Input Voltage

What causes a P1842 error code?

The most common causes of P1842 include: Shift Solenoid 1-2 Malfunction; Open or short circuit in the circuit; Bad contacts in connectors; Transmission control module (TCM) malfunction.

How do I fix a P1842 diagnostic trouble code?

To fix P1842: Check the integrity of wiring and connectors. Check solenoid resistance. Check voltage in solenoid circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1842?

Yes, but get it checked soon

How much does it cost to fix P1842?

The estimated repair cost for P1842 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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