What Does P1427 Mean?
The Mass Air Flow (MAF) sensor circuit has detected a short circuit condition. The sensor voltage is abnormally low, indicating a short to ground in the sensor or wiring.
Common Causes
40%
Shorted MAF sensor element or internal circuit
30%
Wiring harness shorted to ground between MAF and ECM
15%
Water or contamination inside MAF sensor connector causing short
10%
Damaged ECM pins or internal short in ECM
5%
Aftermarket air intake modifications causing sensor damage
Diagnostic Steps
1
Step 1: Inspect MAF sensor connector for water intrusion, corrosion, or bent pins
2
Step 2: Disconnect MAF sensor and measure resistance between signal pins and ground (should show open circuit/high resistance)
3
Step 3: Check wiring harness for chafing, pinching, or damage between MAF sensor and ECM
4
Step 4: Measure voltage at MAF sensor connector with key on (should show 5V reference and proper ground)
5
Step 5: If all wiring checks good, replace MAF sensor and retest
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
The Mass Air Flow (MAF) sensor circuit has detected a short circuit condition. The sensor voltage is abnormally low, indicating a short to ground in the sensor or wiring.
The most common cause of P1427 (EGI Mini - MAF Failed Short Circuit) is: Shorted MAF sensor element or internal circuit
Typical repair costs for P1427 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may run poorly or enter limp mode with reduced power. Safe to drive short distances but repair soon to prevent catalytic converter damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1427 to identify the root cause.
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Quick Info
Category
Powertrain
System
Air/Fuel Metering
Difficulty
Type
Manufacturer
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