Code
P2300
LAND ROVER
P — Powertrain
Ignition coil High control circuit P23D
Views:
UK: 16
EN: 36
RU: 28
AI status
Completed
Completed
100%
Causes
- Damaged, corroded, or disconnected coil harness connector
- Open or shorted wiring in the coil high-side circuit (short to battery or short to ground)
- Faulty ignition coil (internal short or open)
- Failed ignition driver inside the ECM/BCM
- Poor or missing ground(s) for coils or ECM
- Blown fuse or faulty relay supplying coil power
Symptoms
- Malfunction Indicator Lamp (MIL) on
- Engine misfire or multiple-cylinder misfires
- Rough idle or poor running
- Hard starting or no-start condition
- Reduced engine power and acceleration
- Increased fuel consumption and emissions
What to check
- Read freeze frame and pending/fault history with a scan tool; note affected cylinder(s)
- Visually inspect coil connectors, wiring harness, and engine grounds for damage or corrosion
- Check fuses and relays that feed the ignition coils
- Backprobe the coil high-side pin with ignition ON and while cranking to observe voltage behavior
- Measure primary coil resistance and compare to manufacturer specification
- Swap the suspect coil with a known good coil (if applicable) to see if the code follows the coil
Signal parameters
- Coil high-side supply: battery voltage (~12 V) present at key ON; may be switched by driver during operation
- Driver output: expected switching behavior when commanded (observe ON/OFF transitions during crank/run)
- Primary coil resistance: compare to Land Rover spec for affected coil (varies by model; check manual)
- No persistent short to battery or low-resistance path between high-side feed and B+ or ground when circuits are idle
Diagnostic algorithm
- Retrieve full freeze-frame and all related codes. Note which cylinder(s) affected and whether code is intermittent or permanent.
- Visually inspect coil(s), connector(s), and wiring harness for damage, corrosion, or oil/water intrusion. Repair as needed.
- Verify power and ground: with ignition ON, measure battery voltage at the coil high-side feed and check ground continuity at coil ground terminal.
- Backprobe coil connector while cranking/starting: verify expected switching voltage pattern. If high-side is shorted to B+ or stuck, note behavior.
- Measure primary coil resistance against spec. Replace coil if out of specification or if internal short suspected.
- Swap the suspect coil with another cylinder (if coils are identical) and re-scan. If the code follows the coil, replace coil.
- If the problem remains on the same cylinder after swapping coils, inspect wiring harness for shorts/opens and check continuity to ECM pin. Repair harness as needed.
- Check for damaged ECM connector pins and poor ECM grounds. If wiring and coils are good, suspect a failed ECM ignition driver — confirm with manufacturer diagnostic procedures before replacing ECM.
- Clear codes and perform a road test to confirm repair. Monitor for reappearance of P2300/P23D and related misfire codes.
Likely causes
- Wire chafing causing short to battery on high-side feed
- Corroded/loose connector at the affected coil
- Defective ignition coil primary winding or internal short
- Failed high-side MOSFET/driver in the engine management module
- Intermittent open circuit in harness between coil and fuse/relay
Fault status
Status
Ignition coil high-side control circuit fault detected (P2300 / P23D). Inspect coil, wiring, fuses/relays, and ECM driver.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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