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Home / DTC / P2729 — Pressure Control Solenoid E Control Circuit Low

P2729 — Pressure Control Solenoid E Control Circuit Low

Detailed page for trouble code P2729.

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Code

P2729

Generic P — Powertrain

Pressure Control Solenoid E Control Circuit Low

Brand: Generic
Type: P — Powertrain
Views: UK: 12 EN: 19 RU: 12
AI status
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Page language: EN

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

  1. Connect a scan tool, read/record all codes and freeze-frame data. Confirm P2729 is active or was recently set.
  2. Visually inspect the solenoid connector, wiring harness, and grounds for damage, corrosion, pin push-out, or fluid contamination.
  3. Verify battery voltage (key on, engine off) and check relevant fuses/relays. Repair as needed.
  4. 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.
  5. 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.
  6. Check continuity between solenoid harness pin and the control module pin. Repair any opens.
  7. If wiring shows short to ground or short to battery, isolate and repair wiring harness or replace damaged connector.
  8. 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.
  9. 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.
  10. 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

Similar codes

P2728 P2714 P0741 P2766 P2757
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