What Does P1352 Mean?
P1352 indicates a malfunction in the primary circuit of ignition coil A. The ECU has detected an abnormal condition in the circuit that drives the primary winding of coil A, which could be a short, open, or erratic signal. This prevents proper spark delivery to the cylinder(s) fired by coil A, causing misfires and rough engine operation.
Safety Warning
A coil primary circuit fault causes misfires that reduce power, increase emissions, and can damage the catalytic converter. On waste-spark systems, coil A may serve two cylinders, doubling the impact.
Common Causes
30%
Failed ignition coil A (internal primary winding fault)
25%
Damaged wiring in the coil A primary circuit
20%
Corroded or loose coil A electrical connector
15%
Ignition control module failure affecting coil A drive signal
10%
Poor ground connection at the coil or ignition module
Diagnostic Steps
1
Measure ignition coil A primary resistance (typically 0.4-2.0 ohms depending on coil type). An out-of-range reading indicates coil failure.
2
Inspect the coil A connector for heat damage, corrosion, or loose/bent terminals. Coil-on-plug connectors are particularly susceptible to heat degradation.
3
Check for battery voltage supply at the coil B+ terminal with key on. No voltage indicates a power supply issue (fuse, relay, or feed wire).
4
Verify the ground circuit for coil A has less than 0.5 ohms resistance to chassis ground.
5
Use an oscilloscope to capture the coil A primary ignition waveform and compare to a known-good coil pattern. Look for abnormal dwell time, burn time, or oscillation patterns.
6
If the coil and wiring test good, check the ignition module or ECU coil driver output for proper switching.
Estimated Repair Cost
$80 - $400
Parts + labor, varies by vehicle and location
P1352 indicates a malfunction in the primary circuit of ignition coil A. The ECU has detected an abnormal condition in the circuit that drives the primary winding of coil A, which could be a short, open, or erratic signal. This prevents proper spark delivery to the cylinder(s) fired by coil A, causi...
The most common cause of P1352 (Ignition Coil A Primary Circuit Malfunction) is: Failed ignition coil A (internal primary winding fault)
Typical repair costs for P1352 range from $80 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A coil primary circuit fault causes misfires that reduce power, increase emissions, and can damage the catalytic converter. On waste-spark systems, coil A may serve two cylinders, doubling the impact.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1352 to identify the root cause.
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