P0899

Transmission Control System MIL Request Circuit High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–111 (est.)

Symptoms

Check Engine Light Is On
The transmission goes into emergency mode
Limited gear shift
Reduced engine power
Possible problems with cruise control

Causes

Short circuit in MIL request circuit
Broken wiring
Transmission control module (TCM) malfunction
Relay or fuse problems
Corrosion of contacts in connectors

How to Fix

Check wiring continuity in MIL request circuit
Inspect TCM connectors for corrosion or damage.
Check MIL Request Circuit Voltage
Test or replace TCM if necessary
Check and replace damaged relays or fuses

Related codes

P0897 P0898 P0700