What Does P1357 Mean?
The ignition circuit for cylinder 1 has detected a short circuit to ground. This prevents proper spark delivery to cylinder 1, causing a misfire condition.
Common Causes
40%
Damaged ignition coil primary winding shorted to ground
30%
Chafed or damaged ignition coil control wire touching ground
20%
Failed ignition coil driver circuit in PCM or IDM
10%
Moisture or contamination in ignition coil connector
Diagnostic Steps
1
Step 1: Disconnect ignition coil for cylinder 1 and check if code clears (isolate coil vs wiring)
2
Step 2: Measure resistance of ignition coil primary winding (typically 0.5-2 ohms)
3
Step 3: Inspect wiring from PCM/IDM to coil for damage, chafing, or exposed wire
4
Step 4: Test for short to ground on control wire with coil disconnected using ohmmeter
5
Step 5: Monitor coil control signal with oscilloscope during cranking if wiring tests pass
Estimated Repair Cost
$120 - $450
Parts + labor, varies by vehicle and location
The ignition circuit for cylinder 1 has detected a short circuit to ground. This prevents proper spark delivery to cylinder 1, causing a misfire condition.
The most common cause of P1357 (Cyl. 1, ignition circuit Short to ground) is: Damaged ignition coil primary winding shorted to ground
Typical repair costs for P1357 range from $120 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Engine will run rough with reduced power and poor fuel economy. Extended driving may damage the catalytic converter due to unburned fuel.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1357 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
Type
Manufacturer
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