Code
P2721
Generic
P — Powertrain
Pressure Control Solenoid D Control Circuit High
Views:
UK: 23
EN: 47
RU: 17
AI status
Completed
Completed
100%
Causes
- Open, short to battery, or short to voltage in solenoid D wiring
- Corroded, loose, or pushed‑out connector at solenoid or TCM
- Faulty pressure control solenoid D (coil shorted internally)
- Faulty TCM/PCM driver (stuck output or internal short)
- Blown fuse or relay supplying solenoid circuit
- Water or debris intrusion in harness or transmission connector
Symptoms
- MIL (Check Engine/Transmission) illuminated
- Harsh, delayed, or erratic shifting
- Transmission stuck in limp/limited‑gear mode
- Engine revs without proper gear engagement (slip)
- Transmission fluid leaking or contaminated (sometimes)
- Diagnostic trouble code P2721 stored
What to check
- Read and record freeze frame and all stored transmission codes with a capable scan tool
- Check battery voltage and charging system (low voltage can affect readings)
- Visually inspect wiring and connectors at transmission solenoid pack and TCM for damage, corrosion, or water intrusion
- Backprobe solenoid D connector and measure voltages with key ON and while commanded by scan tool
- Measure coil resistance of solenoid D (compare to manufacturer spec and to other solenoids)
- Perform wiggle test on wiring while monitoring live data for intermittent changes
Signal parameters
- Typical solenoid coil resistance (varies by vehicle): approximately 10–40 ohms — consult OEM spec
- Driver command: PWM duty cycle 0–100% when active (frequency commonly 20–300 Hz depending on design)
- Idle/uncommanded voltage at control terminal: depends on driver topology — may be near battery voltage or near 0 V; compare to known good circuit
- When commanded ON, voltage waveform should show PWM switching (use scope) rather than a constant over‑voltage
- High circuit fault means measured voltage or signal level is above expected threshold for the control circuit (short to battery or internal driver fault)
Diagnostic algorithm
- Capture freeze frame and all related codes; note conditions when code set (temp, load, shift state).
- Clear codes and perform a road test while monitoring line pressure, solenoid D status, and any transmission faults to attempt to reproduce.
- Visually inspect connectors and harness at solenoid pack and TCM for corrosion, bent pins, water entry, or rubbing against chassis.
- With key ON (engine off), backprobe solenoid D harness: measure voltage at the control pin and compare to spec. Check for constant battery voltage (indicates short to battery) or open circuit.
- Command solenoid D ON/OFF with scan tool while observing voltage/waveform. Use an oscilloscope if available to verify PWM and look for stuck/high voltage.
- Measure coil resistance of solenoid D with connector disconnected. Compare to spec and to other solenoids; replace solenoid if out of range or shorted.
- Check continuity from solenoid connector to TCM and check for short to battery or ground. Repair any damaged wiring or connectors.
- If wiring and solenoid test normal, test or swap the TCM driver (or replace TCM) only after eliminating harness and solenoid as causes and following OEM procedures.
- After repairs, clear codes and road test to confirm proper operation and that P2721 does not return.
- Safety note: if internal transmission work is required, follow manufacturer procedures for fluid handling and component replacement.
Likely causes
- Damaged wiring or connector (short to battery) at Solenoid D
- Failed pressure control solenoid D
- Faulty TCM output driver
- Poor ground or supply to solenoid circuit
Fault status
Status
Pressure Control Solenoid D control circuit voltage higher than expected (short to voltage or driver fault) detected by TCM.
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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Code
P2721
LAND ROVER
P — Powertrain
Pressure control solenoid Control D - high circuit
Views:
UK: 1
EN: 5
RU: 2
AI status
Completed
Completed
100%
Causes
- Open, short to battery, or short to voltage in solenoid D wiring
- Corroded, loose, or pushed‑out connector at solenoid or TCM
- Faulty pressure control solenoid D (coil shorted internally)
- Faulty TCM/PCM driver (stuck output or internal short)
- Blown fuse or relay supplying solenoid circuit
- Water or debris intrusion in harness or transmission connector
Symptoms
- MIL (Check Engine/Transmission) illuminated
- Harsh, delayed, or erratic shifting
- Transmission stuck in limp/limited‑gear mode
- Engine revs without proper gear engagement (slip)
- Transmission fluid leaking or contaminated (sometimes)
- Diagnostic trouble code P2721 stored
What to check
- Read and record freeze frame and all stored transmission codes with a capable scan tool
- Check battery voltage and charging system (low voltage can affect readings)
- Visually inspect wiring and connectors at transmission solenoid pack and TCM for damage, corrosion, or water intrusion
- Backprobe solenoid D connector and measure voltages with key ON and while commanded by scan tool
- Measure coil resistance of solenoid D (compare to manufacturer spec and to other solenoids)
- Perform wiggle test on wiring while monitoring live data for intermittent changes
Signal parameters
- Typical solenoid coil resistance (varies by vehicle): approximately 10–40 ohms — consult OEM spec
- Driver command: PWM duty cycle 0–100% when active (frequency commonly 20–300 Hz depending on design)
- Idle/uncommanded voltage at control terminal: depends on driver topology — may be near battery voltage or near 0 V; compare to known good circuit
- When commanded ON, voltage waveform should show PWM switching (use scope) rather than a constant over‑voltage
- High circuit fault means measured voltage or signal level is above expected threshold for the control circuit (short to battery or internal driver fault)
Diagnostic algorithm
- Capture freeze frame and all related codes; note conditions when code set (temp, load, shift state).
- Clear codes and perform a road test while monitoring line pressure, solenoid D status, and any transmission faults to attempt to reproduce.
- Visually inspect connectors and harness at solenoid pack and TCM for corrosion, bent pins, water entry, or rubbing against chassis.
- With key ON (engine off), backprobe solenoid D harness: measure voltage at the control pin and compare to spec. Check for constant battery voltage (indicates short to battery) or open circuit.
- Command solenoid D ON/OFF with scan tool while observing voltage/waveform. Use an oscilloscope if available to verify PWM and look for stuck/high voltage.
- Measure coil resistance of solenoid D with connector disconnected. Compare to spec and to other solenoids; replace solenoid if out of range or shorted.
- Check continuity from solenoid connector to TCM and check for short to battery or ground. Repair any damaged wiring or connectors.
- If wiring and solenoid test normal, test or swap the TCM driver (or replace TCM) only after eliminating harness and solenoid as causes and following OEM procedures.
- After repairs, clear codes and road test to confirm proper operation and that P2721 does not return.
- Safety note: if internal transmission work is required, follow manufacturer procedures for fluid handling and component replacement.
Likely causes
- Damaged wiring or connector (short to battery) at Solenoid D
- Failed pressure control solenoid D
- Faulty TCM output driver
- Poor ground or supply to solenoid circuit
Fault status
Status
Pressure Control Solenoid D control circuit voltage higher than expected (short to voltage or driver fault) detected by TCM.
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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Was this AI description helpful?
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