OBD-II Fault Code

C1871: Air Suspension Gate Solenoid Output Circuit Short To Battery

Meaning, symptoms, likely causes, diagnostic checks and repair guidance for C1871.

System family

Chassis

Manufacturer-specific

Repair category

Transmission / driveline

Use this category to narrow your checks before replacing parts.

Severity

High

Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.

What C1871 usually means

Air Suspension Gate Solenoid Output Circuit Short To Battery.

Common symptoms

ABS/traction/steering/suspension warning lamp or abnormal chassis behaviour; Harsh shifting, limp mode, slipping or delayed engagement possible

Likely causes

Low/dirty transmission fluid; Solenoid/valve body issue; Wiring fault; Internal transmission wear; Wire shorted to power feed; Incorrectly repaired harness; Internal component short

Diagnostic checks

Inspect wheel/brake/suspension area, connectors, sensor wiring and module power/ground; Check transmission fluid level/condition using correct procedure; Scan TCM data and inspect connector/wiring; Check for unwanted voltage on signal/control circuit

Repair guidance

Service/repair fluid or wiring issues first, test solenoid/valve body, seek transmission specialist for internal faults; Repair harness short to power or replace internally shorted component

Verification after repair

Clear code, road-test safely at low speed first, then rescan

Note: Confirm vehicle make/model/year because manufacturer-specific codes can vary; Manufacturer-specific: confirm definition and test steps in the vehicle service manual. A DTC identifies a circuit or system condition, not always the failed part.