What Does P1370 Mean?
During a spark test self-diagnostic routine, the ECM detected that engine RPM did not increase as expected. This indicates a problem with spark delivery or ignition system performance.
Common Causes
35%
Multiple weak or failing ignition coils
30%
Worn or fouled spark plugs preventing proper combustion
20%
Low fuel pressure or fuel delivery issue during test
10%
Crankshaft or camshaft position sensor signal issues
5%
Poor engine compression affecting RPM increase
Diagnostic Steps
1
Step 1: Perform manual spark test on all cylinders to verify spark strength and quality
2
Step 2: Inspect all spark plugs for wear, fouling, or incorrect gap
3
Step 3: Test fuel pressure during cranking and compare to specifications
4
Step 4: Check compression on all cylinders to rule out mechanical issues
5
Step 5: Verify timing sensor signals are within normal parameters during cranking
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
During a spark test self-diagnostic routine, the ECM detected that engine RPM did not increase as expected. This indicates a problem with spark delivery or ignition system performance.
The most common cause of P1370 (Insufficient RMP Increase During Spark Test) is: Multiple weak or failing ignition coils
Typical repair costs for P1370 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause hard starting, rough idle, or poor performance. Generally safe to drive but should be repaired promptly to prevent further damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1370 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System / Engine Performance
Difficulty
Type
Manufacturer
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