P0986

Code

Generic P — Powertrain

Shift Solenoid E Control Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 28 EN: 62 RU: 47

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Page language: EN

Causes

Open or shorted wiring in the shift solenoid E circuit
Connector corrosion, bent pins, or poor terminal contact
Shift solenoid E internal failure (shorted coil or intermittent)
Short to battery voltage (power feed) on the control wire
Faulty ground or power supply to the transmission control module
Faulty TCM/PCM internal driver

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Transmission may default to limp/backup mode (reduced gears)
Harsh, delayed, or missing shifts
Gear selection erratic or stuck in one gear
Possible decreased drivability and fuel economy
Diagnostic trouble code P0986 stored

What to check

Read/record DTC(s) and freeze frame data with a capable scan tool
Visual inspection of transmission wiring harness, connectors, and pins for damage or corrosion
Check related fuses and relays for continuity and proper operation
Measure battery voltage and vehicle grounds before testing circuits
Check for technical service bulletins (TSBs) or known issues for the vehicle
Perform wiggle test on harness while monitoring code or live data

Signal parameters

Expected solenoid coil resistance: typically ~10–40 ohms (varies by vehicle). Compare to manufacturer spec.
When SOL E is commanded ON (TCM grounds the circuit): control wire voltage should be near 0–1 V
When SOL E is commanded OFF: control wire may be pulled up to battery voltage (~11–14 V) depending on circuit design
Open circuit or short to battery typically shows a high voltage on the control circuit when solenoid is commanded ON
Cranking/running current draw for a healthy solenoid usually measurable; excessive or no current indicates a problem

Diagnostic algorithm

Retrieve all stored codes and freeze-frame data. Note any other transmission codes present.
Perform a visual inspection of the solenoid connector and harness. Repair any obvious damage or corrosion.
Disconnect battery or follow vehicle-specific safety procedures before connector resistance checks if required.
Measure solenoid coil resistance at the solenoid connector and compare to spec. Replace solenoid if out of range or intermittent.
With ignition on, backprobe the control wire and monitor voltage while commanding the solenoid ON/OFF with a scan tool. Verify voltages match expected signal parameters.
If voltage is high when commanded ON, isolate wiring between solenoid and TCM: check for short to battery, fused power feed, or open ground. Repair or replace damaged wiring/connectors.

Likely causes

Corroded or damaged connector at the solenoid
Open or shorted wiring harness (chafing, pinched, rodent damage)
Failed solenoid coil (out-of-spec resistance or intermittent)
Short to battery voltage on the control wiring
Faulty transmission control module (less common)

Fault status

⚠️ Status

Voltage on shift solenoid E control circuit is higher than expected. Possible open/short to power, faulty solenoid, connector/wiring fault, or defective transmission control module. MIL set and transmission may enter limp mode.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours