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Home / DTC / P0772 — Shift Solenoid E Stuck On

P0772 — Shift Solenoid E Stuck On

Detailed page for trouble code P0772.

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Code

P0772

MERCEDES-BENZ P — Powertrain

Shift Solenoid E Stuck On

Brand: MERCEDES-BENZ
Type: P — Powertrain
AI status
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Completed 100%
Page language: EN

Causes

  • Electrical short (voltage present when solenoid should be off)
  • Open or shorted solenoid coil / internal failure
  • Wiring harness damage, chafing or corroded connector
  • Valve body or solenoid valve mechanically stuck (contamination/debris)
  • Low or contaminated transmission fluid
  • Faulty TCM driver circuitry or software issue

Symptoms

  • Harsh, delayed or erratic shifting
  • Transmission stuck in a single gear or inability to shift into certain gears
  • Transmission slipping or flare during shift events
  • Illuminated check engine lamp / transmission warning light
  • Vehicle enters limp-home mode

What to check

  • Read and record freeze frame and live data with a capable scan tool
  • Check transmission fluid level and condition (contamination, burnt smell)
  • Visually inspect solenoid connector(s) and wiring for damage, corrosion, or pin push-out
  • Backprobe solenoid connector to verify voltage and ground states while commanding solenoid
  • Measure coil resistance of the solenoid with the connector disconnected
  • Command solenoid ON/OFF with scan tool and observe response (electrical and mechanical)

Signal parameters

  • Steady voltage to solenoid when commanded ON: approx. battery voltage (near 12V) at connector
  • No voltage (or low) when commanded OFF; presence of voltage when OFF indicates fault
  • Coil resistance (typical range for many transmission solenoids): ~10–40 ohms (manufacturer-specific — compare to factory spec)
  • Control often via PWM duty cycle when modulated; frequency varies by design (commonly tens to a few hundred Hz)
  • Activation should be repeatable and correspond to TCM commands in live data

Diagnostic algorithm

  1. Retrieve and record DTCs and freeze-frame data. Clear codes and attempt to re-create the fault with a road test while monitoring live data.
  2. Inspect transmission fluid level and condition. Replace or top up if severely low or contaminated; note fluid change may affect symptoms.
  3. Visually inspect electrical connector and wiring to the shift solenoid E for corrosion, bent pins, melted insulation, or damage. Repair as needed.
  4. With ignition on (engine off), disconnect the solenoid connector and measure coil resistance across the solenoid terminals. Compare to manufacturer spec. Replace solenoid if out of spec or open/shorted.
  5. Backprobe connector while commanding the solenoid ON/OFF with a scan tool. Verify the TCM is commanding and that voltage/ground behaviour matches commands (voltage present only when commanded ON).
  6. If voltage is present when the solenoid is commanded OFF, test for short to battery (inspect wiring for pinched or chafed areas). If no wiring short found, suspect TCM driver fault.
  7. If electrical checks are normal but solenoid remains active or transmission behaviour unchanged, remove valve body/solenoid assembly for inspection. Look for debris, stuck valve, or hydraulic faults; clean or replace affected components.
  8. After repairs or component replacement, clear codes and perform a full test drive and re-scan. If replacement of solenoid or valve body does not clear condition, consider TCM reprogramming or replacement after confirming wiring and solenoid integrity.
  9. Document findings and perform final road test to confirm proper shifting and that code does not return.

Likely causes

  • Short to battery/constant power on the solenoid circuit
  • Solenoid coil partially shorted internally and stuck energised
  • Contaminant or debris holding valve in the open/energised position
  • Corroded connector causing intermittent contact interpreted as stuck ON
  • Faulty TCM output stage (driver transistor) driving the solenoid when it should not

Fault status

⚠️ Status
Shift Solenoid E Stuck On — control module detects solenoid E is continuously energised or not responding to OFF command.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0770 P0771 P0773 P0760 P0740 P0700
856

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