Code
P2729
Generic
P — Powertrain
Pressure Control Solenoid E Control Circuit Low
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between the control module and solenoid
- Damaged or corroded connector or pin at solenoid or control module
- Faulty pressure control solenoid E (coil shorted or open)
- Low battery or poor power/ground at the transmission harness
- Blown fuse or relay supplying the solenoid circuit
- Faulty transmission control module (rare)
Symptoms
- MIL/Check Engine lamp illuminated
- Transmission may hunt, shift harshly, slip, or go into limp/limited mode
- Delayed shifts or inability to shift into certain gears
- Erratic line pressure-related behavior
- Stored transmission-related fault codes
What to check
- Retrieve freeze frame and all transmission codes with a scan tool; note operating conditions
- Perform visual inspection of transmission wiring and connectors for damage, corrosion, or pin push-out
- Check battery voltage and charging system health
- Inspect fuses/relays for the transmission/solenoid circuits
- Backprobe solenoid connector while commanding solenoid with scan tool to verify control voltage/PWM
- Measure solenoid coil resistance (compare to specification) and check continuity to control module
Signal parameters
- Command voltage: 0 V when off, battery voltage or PWM when commanded (typical system battery ~12 V)
- PWM duty cycle: 0–100% depending on commanded pressure (varies by vehicle)
- Typical coil resistance (generic): roughly 5–50 ohms (manufacturer spec required)
- Expected voltage at driver pin while commanded: pulsed up to battery voltage; uncommanded should be near 0 V or high-impedance
- No continuity to ground on the control signal when solenoid is not commanded to ground (check for shorts)
Diagnostic algorithm
- Connect a scan tool, read/record all codes and freeze-frame data. Confirm P2729 is active or was recently set.
- Visually inspect the solenoid connector, wiring harness, and grounds for damage, corrosion, pin push-out, or fluid contamination.
- Verify battery voltage (key on, engine off) and check relevant fuses/relays. Repair as needed.
- With connector connected, backprobe the solenoid control pin. Command the solenoid ON/OFF with a scan tool and observe voltage/PWM. Note if signal is present and changes with commands.
- With power OFF, disconnect the solenoid connector and measure coil resistance between solenoid terminals. Compare to spec. Check for short to ground or short to battery from the harness side.
- Check continuity between solenoid harness pin and the control module pin. Repair any opens.
- If wiring shows short to ground or short to battery, isolate and repair wiring harness or replace damaged connector.
- If wiring and connectors are good but coil resistance indicates a fault or solenoid does not actuate when bench-powered, replace pressure control solenoid E.
- If wiring, power, and new solenoid are good but code returns, consider testing or replacing the TCM/PCM or further internal transmission diagnostics (valve body) — involve specialized diagnostics.
- Clear codes and test drive to confirm repair. Recheck for reappearance of P2729 and related codes.
Likely causes
- Wiring harness damage (chafed wire or broken conductor) to solenoid E
- Corroded/loose connector at solenoid or at control module
- Failed solenoid coil
- Missing/poor ground or low battery voltage
Fault status
Status
Control circuit low for Pressure Control Solenoid E — voltage below expected threshold or short to ground detected by transmission control module.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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