P0842 on Chevrolet
Transmission Fluid Pressure Sensor/Switch 'A' Circuit Low
P0842 on Chevrolet vehicles indicates transmission fluid pressure sensor/switch 'a' circuit low. Au7o has documented this code across 1 Chevrolet model — most commonly on Silverado 1500. The transmission fluid pressure sensor/switch 'A' circuit voltage is below the expected range (too low / shorted to ground). Typical repair costs on Chevrolet range from $300 to $1,600, depending on the specific model and root cause.
Common Causes of P0842
- •Sensor signal shorted to ground
- •Faulty pressure sensor/switch A
- •Corroded/damaged connector
- •Internal TCM fault
P0842 on Chevrolet by Model
Chevrolet Silverado 1500(1 issue)
- P0700 — Transmission Control System Malfunction from Failed 6L80 TEHCM (or 4L60E Shift Solenoid)2007-2019
P0700 is not a specific fault by itself — it is an umbrella/MIL-request code the ECM stores whenever the transmission control module (TCM) detects an internal transmission problem and asks the ECM to turn on the check-engine light. On the Silverado 1500 it almost always appears alongside more specific companion codes, and the underlying failure follows two dominant, well-documented patterns depending on the transmission. On trucks with the 6L80 six-speed automatic (2007-onward 5.3L and 6.2L V8 models), the internal TEHCM (Transmission Electro-Hydraulic Control Module — GM's combined valve body, solenoids, pressure switches, and TCM in a single pan-mounted unit) develops internal circuit-board/solenoid faults from heat and fluid degradation, throwing P0700 together with codes like P0796, P0777, P0842, or P0973 and dropping the truck into limp mode. On older/base trucks with the 4L60E four-speed (4.3L/4.8L), the same P0700 is typically triggered by a failed shift solenoid (P0753/P0758) or a faulty internal mode switch. Because P0700 is a stored 'passenger' code, a scan tool that can talk to the TCM (not just a basic reader) is required to pull the specific sub-code that identifies the actual failed component.
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View P0842 across all makes →Frequently Asked Questions
What does P0842 mean on Chevrolet?▼
P0842 stands for "Transmission Fluid Pressure Sensor/Switch 'A' Circuit Low." The transmission fluid pressure sensor/switch 'A' circuit voltage is below the expected range (too low / shorted to ground). On Chevrolet specifically, this code is documented across 1 model.
What causes P0842 on Chevrolet vehicles?▼
Common causes on Chevrolet: Sensor signal shorted to ground, Faulty pressure sensor/switch A, Corroded/damaged connector, Internal TCM fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0842 on a Chevrolet?▼
Repair costs on Chevrolet range from $300 to $1,600, depending on the specific model and root cause.
Which Chevrolet models have P0842 documented?▼
Au7o has documented P0842 on 1 Chevrolet model: Silverado 1500.