P2534 on GMC
Ignition Switch 'Run/Start' Position Circuit Low
P2534 on GMC vehicles indicates ignition switch 'run/start' position circuit low. Au7o has documented this code across 1 GMC model — most commonly on Sierra 1500. The PCM detects the ignition switch 'Run/Start' position circuit voltage is below the expected minimum (short to ground or high resistance), so the run/start signal is read incorrectly. Typical repair costs on GMC range from $600 to $2,500, depending on the specific model and root cause.
Common Causes of P2534
- •Short to ground in run/start wiring
- •Faulty ignition switch
- •High-resistance/corroded connections
- •Harness damage
- •Shorted related fuse circuit
P2534 on GMC by Model
GMC Sierra 1500(1 issue)
- P0700 — Transmission Fault Flag from Failing 6L80/6L90 Internal TEHCM2007-2018
P0700 itself is only a flag: the Transmission Control Module has stored one or more transmission faults and is requesting the MIL. On Sierra 1500s with the 6L80 (and 6L90 on heavier variants) 6-speed automatic, the notable design issue is that the TCM is integrated into the valve body as a TEHCM (transmission electro-hydraulic control module), bolted inside the pan and sitting in 180-250°F fluid. Repeated heat cycling degrades the module and its integrated pressure switches and solenoids. When the TEHCM or a shift/pressure-control solenoid begins to fail, it sets specific sub-codes (e.g., P2534, P0742, P0761) plus the umbrella P0700, and the truck can exhibit harsh or missed shifts, slipping, or limp mode. Critically, on the 6L80/6L90 the solenoids are over-molded into the non-serviceable TEHCM and generally can't be replaced individually.
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View P2534 across all makes →Frequently Asked Questions
What does P2534 mean on GMC?▼
P2534 stands for "Ignition Switch 'Run/Start' Position Circuit Low." The PCM detects the ignition switch 'Run/Start' position circuit voltage is below the expected minimum (short to ground or high resistance), so the run/start signal is read incorrectly. On GMC specifically, this code is documented across 1 model.
What causes P2534 on GMC vehicles?▼
Common causes on GMC: Short to ground in run/start wiring, Faulty ignition switch, High-resistance/corroded connections, Harness damage, Shorted related fuse circuit. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2534 on a GMC?▼
Repair costs on GMC range from $600 to $2,500, depending on the specific model and root cause.
Which GMC models have P2534 documented?▼
Au7o has documented P2534 on 1 GMC model: Sierra 1500.