B1362 — Ignition Run/Acc Circuit Short To Ground

Will B1362 clear itself?

Sometimes B1362 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What does OBD2 code B1362 mean?

B1362 — Ignition Run/Acc Circuit Short To Ground. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: worn spark plugs or wrong plug gap, faulty ignition control circuit in the ECM, moisture or oil in the spark plug wells.

How do I diagnose B1362 myself?

Start with a scan: confirm B1362, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the ignition system, and verify the suspect component against live data before buying parts.

Is it safe to drive with B1362?

Drive with caution and avoid load. Ignition faults cause misfires that quickly overheat and destroy the catalytic converter; if the Check Engine Light flashes, stop and fix it first.

What is the most common cause of B1362?

The most common causes are: worn spark plugs or wrong plug gap, faulty ignition control circuit in the ECM, moisture or oil in the spark plug wells.

When your engine control module detects a problem with the ignition run/acc circuit, it sets trouble code B1362. This code specifically points to a short to ground in that circuit — meaning electricity intended to power the ignition system is leaking to the chassis instead of doing its job. The ignition run/acc circuit is responsible for delivering voltage to ignition coils and related components while the engine is running or the key is in the accessory position.

The PCM (Powertrain Control Module, often called the ECU) doesn't just throw this code randomly. It compares real-time sensor data from the ignition system against factory-set parameters, typically over multiple drive cycles, before confirming the fault. Once B1362 is stored, the module also captures a freeze frame — essentially a snapshot of engine conditions at the exact moment the problem occurred. That snapshot matters. It tells you what RPM the engine was running at, what the load percentage was, what the coolant temperature read, and how fast you were going when the fault was detected. You can pull this data with any basic OBD2 scanner, and it points you toward the right cylinder or condition to investigate first.

Symptoms

• The Check Engine Light illuminates on the dashboard
• The engine runs rough, stumbles, or jerks during acceleration
• Noticeable drop in fuel economy
• Hard starting, particularly in damp or rainy conditions
• Loss of engine power and hesitation under load
• Misfires that may occur at idle or under acceleration

Causes

Damaged or corroded wiring in the ignition circuit and poor connector contacts are the most common triggers for B1362. Worn or improperly gapped spark plugs create resistance that can trigger the code. Moisture or oil inside spark plug wells breaks down the insulation and allows short circuits. Failed ignition coils or coil packs lose their ability to regulate voltage properly. In rare cases, the ECM itself may develop an internal ignition control circuit fault.

How to diagnose

1. Plug in an OBD2 scanner, retrieve code B1362, and record the freeze frame data — this shows engine operating conditions when the failure occurred.
2. Look for any other trouble codes stored alongside B1362; related codes often point to the true source of the problem. Check for manufacturer TSBs covering your vehicle — factory service bulletins sometimes document known issues and software updates for this type of fault.
3. Perform a thorough visual inspection of the ignition circuit wiring and connectors. Look for frayed wires, broken insulation, corrosion, loose terminals, and any signs of oil or moisture intrusion.
4. Test the ignition coil by swapping it with a known-good unit from another cylinder. If B1362 moves to a different cylinder, the coil is faulty.
5. Remove and inspect the spark plugs. Check for wear, carbon buildup, oil deposits, incorrect gap spacing, or cracked insulation.
6. After completing repairs, clear the code and run the vehicle through a complete drive cycle, including the conditions captured in the freeze frame. The code should not return if the repair was successful.

Repair options with exact prices

• Repair damaged coil wiring or connectors: $80–$250
• Replace a failed ignition coil or coil pack: $150–$380
• Replace worn or damaged spark plugs: $90–$250

How much does it cost to fix B1362?

Depending on which component is actually at fault, total repair costs for B1362 typically fall between $80 and $380 when using an independent shop. The exact amount depends on whether you're replacing spark plugs, an ignition coil, or repairing wiring. Always start with a proper diagnosis before spending money on parts — the least expensive fix is rarely the first part you should replace.

Can you drive with B1362?

Use caution if the Check Engine Light is steady and avoid hard acceleration until you can investigate. An active ignition fault causes misfires that dump raw fuel into the exhaust, and prolonged operation can overheat and destroy the catalytic converter. If the Check Engine Light starts flashing, pull over immediately — a flashing MIL signals a severe misfire that risks serious damage to your exhaust system.

Related OBD2 codes

• B1300: Power Door Lock Circuit Failure
• B1301: Power Door Lock Circuit Open
• B1302: Accessory Delay Relay Coil Circuit Failure
• B1303: Accessory Delay Relay Coil Circuit Open
• B1304: Accessory Delay Relay Coil Circuit Short To Battery
• [B1305: Accessory Delay Relay Coil