What Does P1470 Mean?
The Leak Detection Pump (LDP) circuit has an electrical malfunction preventing proper EVAP system leak testing. This code is common on vehicles using pump-based EVAP leak detection rather than pressure sensor systems.
Common Causes
40%
Failed leak detection pump motor or internal components
25%
Damaged or corroded wiring harness to LDP
20%
Corroded or loose LDP electrical connector
10%
Blocked or restricted LDP hoses causing motor overload
5%
Failed LDP control relay or fuse
Diagnostic Steps
1
Step 1: Locate leak detection pump (typically near fuel tank or engine bay) and inspect connector
2
Step 2: Check voltage supply to LDP with key on (should have battery voltage)
3
Step 3: Measure LDP motor resistance and compare to specifications (typically 8-15 ohms)
4
Step 4: Inspect all vacuum hoses connected to LDP for cracks, blockages, or disconnection
5
Step 5: Test LDP operation by applying 12V directly to pump terminals and listening for motor operation
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
The Leak Detection Pump (LDP) circuit has an electrical malfunction preventing proper EVAP system leak testing. This code is common on vehicles using pump-based EVAP leak detection rather than pressure sensor systems.
The most common cause of P1470 (EVAP Emission Contr.LDP Circ Electrical Malfunction) is: Failed leak detection pump motor or internal components
Typical repair costs for P1470 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No immediate safety risk. Vehicle remains safe to operate but will fail emissions inspection and cannot perform leak detection.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1470 to identify the root cause.
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Quick Info
Category
Powertrain
System
Evaporative Emissions System
Difficulty
Type
Manufacturer
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