Code
P08E5
Generic
P — Powertrain
Shift Solenoid L Control Circuit High
Views:
UK: 17
EN: 42
RU: 28
AI status
Completed
Completed
100%
Causes
- Open or high-resistance wiring/connectors in the Shift Solenoid L circuit
- Short to battery voltage on the solenoid control wire
- Corroded, damaged, or poorly seated transmission connector
- Failed shift solenoid (internal short or intermittent failure)
- Faulty TCM/PCM output driver or internal electronics
- Water intrusion or contamination in the transmission harness or connector
Symptoms
- MIL/Check Engine light illuminated
- Erratic or harsh shifting, delayed shifts, or inability to shift into certain gears
- Transmission slip or stuck in a single gear / limp mode
- Stored transmission-related trouble codes
- Possible unusual transmission noise if solenoid is electrically stuck
What to check
- Scan for stored and pending codes, record freeze frame and readiness status
- Inspect transmission harness and connector for damage, corrosion, or water intrusion
- Visually inspect the solenoid connector and terminal condition; reseat connector
- Check related fuses and power/ground circuits
- Measure voltage at the solenoid harness with connector connected and back-probed while commanding solenoid ON/OFF with a scan tool
- Measure solenoid coil resistance with connector disconnected
Signal parameters
- Typical solenoid coil resistance (varies by design): about 6–30 ohms (consult vehicle-specific spec)
- Supply voltage (with solenoid OFF): approximately battery voltage (9–14 V) on the feed side
- Driver output when commanded ON for low-side driver: near 0–1 V at the module output (solenoid side pulled to ground)
- Driver output when commanded OFF: near battery voltage on the module output for low-side designs (or near 12 V drop across coil)
- Current when energized: typically 0.2–2 A depending on coil resistance and design
Diagnostic algorithm
- Read and record all codes, freeze frame data and stored transmission data with a capable scan tool.
- Check for related codes (other solenoid circuits, communication errors, power/ground faults). If multiple solenoid circuits show high, suspect common power/ground or TCM.
- Visually inspect wiring and connectors from the TCM/PCM to the transmission solenoid pack. Look for chafing, pinched sections, melted insulation, corrosion or signs of fluid contamination.
- With ignition OFF, disconnect the solenoid connector and measure the coil resistance across the solenoid terminals. Compare to vehicle spec. Replace solenoid if out of range or shorted.
- Check continuity from the harness connector to the TCM/PCM pin for the Shift Solenoid L circuit. Verify there is no short to battery (key ON, backprobe for battery voltage with solenoid disconnected) and no short to ground (measure resistance to ground).
- Backprobe the solenoid control wire at the harness, then use a scan tool to command the solenoid ON/OFF while monitoring the voltage. Verify the driver changes state to expected voltages and that the circuit does not remain at a high voltage when it should be low.
- If the solenoid and wiring check good but the output driver does not switch correctly, inspect TCM/PCM grounds and supply voltages. Repair any poor grounds or fuses and re-test.
- If wiring and grounds are good and the solenoid is known good but the module output is incorrect, consider replacing the TCM/PCM after verifying reprogramming requirements and confirming no other causes.
- After repairs, clear codes and perform a road test/stress test under conditions that originally set the code, then re-scan to confirm the code does not return.
- Safety note: isolate battery power when doing connector repairs, and follow vehicle manufacturer procedures for handling and programming control modules.
Likely causes
- Damaged wiring or a loose/corroded connector at the solenoid/transmission harness
- Short to battery voltage on the solenoid control lead
- Failed solenoid (coil partially shorted or intermittent)
- Faulty transmission control module driver (less common)
Fault status
Status
Control module detected a high voltage condition on the Shift Solenoid L control circuit (possible short to battery, open/high resistance, or faulty driver). Code stored and transmission control may enter limp mode until condition is resolved.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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