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Home / DTC / P0986 — Shift Solenoid E Control Circuit High

P0986 — Shift Solenoid E Control Circuit High

Detailed page for trouble code P0986.

34,405codes
59brands
11,914generic
22,491specific
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Code

P0986

Generic P — Powertrain

Shift Solenoid E Control Circuit High

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
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

  1. Retrieve all stored codes and freeze-frame data. Note any other transmission codes present.
  2. Perform a visual inspection of the solenoid connector and harness. Repair any obvious damage or corrosion.
  3. Disconnect battery or follow vehicle-specific safety procedures before connector resistance checks if required.
  4. Measure solenoid coil resistance at the solenoid connector and compare to spec. Replace solenoid if out of range or intermittent.
  5. 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.
  6. 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

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Code

P0986

HUMMER P — Powertrain

Shift Solenoid (SS) 5 Control Circuit High Voltage (TCM)

Brand: HUMMER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
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

  1. Retrieve all stored codes and freeze-frame data. Note any other transmission codes present.
  2. Perform a visual inspection of the solenoid connector and harness. Repair any obvious damage or corrosion.
  3. Disconnect battery or follow vehicle-specific safety procedures before connector resistance checks if required.
  4. Measure solenoid coil resistance at the solenoid connector and compare to spec. Replace solenoid if out of range or intermittent.
  5. 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.
  6. 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

Similar codes

P0985 P0987 P0750 P0760 P0700
Repair manuals

Manual library for HUMMER

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Code

P0986

LAND ROVER P — Powertrain

Control of the E shift solenoid - high circuit

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
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

  1. Retrieve all stored codes and freeze-frame data. Note any other transmission codes present.
  2. Perform a visual inspection of the solenoid connector and harness. Repair any obvious damage or corrosion.
  3. Disconnect battery or follow vehicle-specific safety procedures before connector resistance checks if required.
  4. Measure solenoid coil resistance at the solenoid connector and compare to spec. Replace solenoid if out of range or intermittent.
  5. 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.
  6. 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

Similar codes

P0985 P0987 P0750 P0760 P0700
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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