P0888 on RAM
TCM Power Relay Sense Circuit
P0888 on RAM vehicles indicates tcm power relay sense circuit. Au7o has documented this code across 1 RAM model — most commonly on 2500. This code sets when the transmission control module (TCM) detects an incorrect voltage on the power relay sense circuit, which monitors whether the TCM power relay is supplying voltage as expected. If the relay or its sense circuit is faulty, the TCM cannot confirm it is properly powered to control the transmission. Symptoms can include shifting problems, the transmission entering failsafe mode, and a check engine light. The fault usually lies in the power relay, the sense wiring, or related connections. Typical repair costs on RAM range from $1,500 to $4,800, depending on the specific model and root cause.
Common Causes of P0888
- •Faulty TCM power relay
- •Open, shorted, or corroded sense-circuit wiring
- •Blown fuse in the power/relay circuit
- •Poor or loose connector at the relay or TCM
- •Poor ground connection
- •Low system voltage
- •Faulty TCM (less common)
P0888 on RAM by Model
RAM 2500(1 issue)
- 68RFE Torque Converter Shudder and TCC Failure2007-2024
The 68RFE 6-speed automatic behind the Cummins is prone to torque converter shudder and lockup failure. The factory converter's clutch material and heat control are marginal for the Cummins' torque, so the torque converter clutch (TCC) chatters, slips, or refuses to hold lockup, felt as a low-speed vibration like driving over rumble strips. The TCC regulator valve wears its bore in the valve body, making apply pressure erratic. The resulting heat contaminates the fluid and cascades into planetary and clutch-pack damage. Heat is the number-one killer, especially when towing; fluid temps regularly over 200°F accelerate failure.
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View P0888 across all makes →Frequently Asked Questions
What does P0888 mean on RAM?▼
P0888 stands for "TCM Power Relay Sense Circuit." This code sets when the transmission control module (TCM) detects an incorrect voltage on the power relay sense circuit, which monitors whether the TCM power relay is supplying voltage as expected. If the relay or its sense circuit is faulty, the TCM cannot confirm it is properly powered to control the transmission. Symptoms can include shifting problems, the transmission entering failsafe mode, and a check engine light. The fault usually lies in the power relay, the sense wiring, or related connections. On RAM specifically, this code is documented across 1 model.
What causes P0888 on RAM vehicles?▼
Common causes on RAM: Faulty TCM power relay, Open, shorted, or corroded sense-circuit wiring, Blown fuse in the power/relay circuit, Poor or loose connector at the relay or TCM, Poor ground connection. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0888 on a RAM?▼
Repair costs on RAM range from $1,500 to $4,800, depending on the specific model and root cause.
Which RAM models have P0888 documented?▼
Au7o has documented P0888 on 1 RAM model: 2500.