Luxury Platform Telemetry

Cadillac OBD-II Diagnostics & Fault Codes

Factory diagnostic trouble code directory for Cadillac vehicles (Escalade, Escalade-V, CT5, CT5-V Blackwing, CT4). Access model-specific sensor tolerances, live freeze-frame telemetry, and verified DIY repair procedures.

Reliability Index

High (American Flagship Standard)

Industry Standard

Dealership Labor Rate

$165/hr

National Average

Avg. Sensor Cost

$160 - $280

OEM Direct Replacement

Protocol Standards

ISO 15765-4 CAN

SAE J1979 Compliant

Model Selection

Select Your Cadillac Model (6 Supported)

Ultra-Luxury

2021–2026SUV

Cadillac Escalade

6.2L EcoTec3 V8 (420HP) / 3.0L Duramax Turbo-Diesel Inline-6 (460 lb-ft)

DLC Port GuideDTC Codes

Ultra-Luxury

2023–2026SUV

Cadillac Escalade-V

6.2L Handbuilt Supercharged V8 (682HP / 653 lb-ft torque)

DLC Port GuideDTC Codes

Luxury

2020–2026Sedan

Cadillac CT5

2.0L Twin-Scroll Turbo (237HP) / 3.0L Twin-Turbo V6 (CT5-V 360HP)

DLC Port GuideDTC Codes

Ultra-Luxury

2022–2026Sedan

Cadillac CT5-V Blackwing

6.2L Handbuilt Supercharged LT4 V8 (668HP / 659 lb-ft / 6-Speed Manual / 10-Speed Auto)

DLC Port GuideDTC Codes

Luxury

2020–2026SUV

Cadillac XT5

2.0L Turbo 4-Cyl (237HP) / 3.6L V6 (LGX 310HP)

DLC Port GuideDTC Codes

Luxury

2023–2026EV

Cadillac Lyriq

Ultium Dual Motor AWD (500HP / 450 lb-ft) / Single Motor RWD (340HP)

DLC Port GuideDTC Codes

Brand Telemetry

Most Common Cadillac Check Engine Trouble Codes

P0420Cadillac Specific

Est. DIY Parts: $400 - $1,800 (DIY: $150 - $400)

P0420 on Cadillac: Symptoms & Fix

Factory troubleshooting procedure for P0420: P0420: Catalyst System Efficiency Below Threshold (Bank 1) specifically affecting Cadillac (Escalade, Escalade-V).

5-Step OEM FixDiagnose Cadillac

P0300Cadillac Specific

Est. DIY Parts: $100 - $600 (DIY: $30 - $120)

P0300 on Cadillac: Symptoms & Fix

Factory troubleshooting procedure for P0300: P0300: Random or Multiple Cylinder Misfire Detected specifically affecting Cadillac (Escalade, Escalade-V).

5-Step OEM FixDiagnose Cadillac

P0171Cadillac Specific

Est. DIY Parts: $80 - $350 (DIY: $15 - $70)

P0171 on Cadillac: Symptoms & Fix

Factory troubleshooting procedure for P0171: P0171: System Too Lean (Bank 1) specifically affecting Cadillac (Escalade, Escalade-V).

5-Step OEM FixDiagnose Cadillac

P0128Cadillac Specific

Est. DIY Parts: $120 - $300 (DIY: $25 - $60)

P0128 on Cadillac: Symptoms & Fix

Factory troubleshooting procedure for P0128: P0128: Coolant Temperature Below Thermostat Regulating Temperature specifically affecting Cadillac (Escalade, Escalade-V).

5-Step OEM FixDiagnose Cadillac

P0442Cadillac Specific

Est. DIY Parts: $25 - $200 (DIY: $15)

P0442 on Cadillac: Symptoms & Fix

Factory troubleshooting procedure for P0442: EVAP System Small Leak Detected - Diagnosis & Repair Guide specifically affecting Cadillac (Escalade, Escalade-V).

5-Step OEM FixDiagnose Cadillac

P0500Cadillac Specific

Est. DIY Parts: $140 - $340 (DIY: $30 - $75)

P0500 on Cadillac: Symptoms & Fix

Factory troubleshooting procedure for P0500: P0500: Vehicle Speed Sensor (VSS) Malfunction specifically affecting Cadillac (Escalade, Escalade-V).

5-Step OEM FixDiagnose Cadillac

Full Diagnostic Library

All OBD-II Codes for Cadillac

Showing 1–18 of 122 codes

Active:

1. Filter by Vehicle Manufacturer (25 Makes)

2. DTC System Category

3. Risk Severity Level

P0300Critical Severity

Est. DIY: $100 - $600 (DIY: $30 - $120)

P0300: Random or Multiple Cylinder Misfire Detected

Flashing Check Engine Light (CEL) • Engine shaking, vibrating, or jerking at idle

5 Step DIY GuideTroubleshoot

P0420Medium Severity

Est. DIY: $400 - $1,800 (DIY: $150 - $400)

P0420: Catalyst System Efficiency Below Threshold (Bank 1)

Illuminated Check Engine Light (steady) • Rotten egg / sulfur odor from exhaust

5 Step DIY GuideTroubleshoot

P0171Medium Severity

Est. DIY: $80 - $350 (DIY: $15 - $70)

P0171: System Too Lean (Bank 1)

Check Engine Light on • Rough idling or engine hesitation on acceleration

5 Step DIY GuideTroubleshoot

P0128Low Severity

Est. DIY: $120 - $300 (DIY: $25 - $60)

P0128: Coolant Temperature Below Thermostat Regulating Temperature

Check Engine Light • Cabin heater takes too long to warm up

5 Step DIY GuideTroubleshoot

P0455Low Severity

Est. DIY: $15 - $250 (DIY: $15 - $50)

P0455: Evaporative Emission Control System Leak Detected (Gross Leak)

Check Engine Light on • Gas cap loose warning message on dashboard

5 Step DIY GuideTroubleshoot

P0101Medium Severity

Est. DIY: $45 - $220 (DIY Clean: $12)

Mass Air Flow (MAF) Sensor Circuit Range/Performance

Check Engine Light (CEL) illuminated • Rough or erratic engine idle

4 Step DIY GuideTroubleshoot

P0135Low to Medium Severity

Est. DIY: $80 - $240 (DIY Sensor: $45)

O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

Check Engine Light on • Slightly increased fuel consumption on short trips

3 Step DIY GuideTroubleshoot

P0172Medium Severity

Est. DIY: $30 - $280 (DIY Clean: $15)

System Too Rich (Bank 1) - Symptoms, Causes & Step-by-Step Fix

Check Engine Light on • Strong unburnt fuel odor from exhaust

3 Step DIY GuideTroubleshoot

P0442Low Severity

Est. DIY: $25 - $200 (DIY: $15)

EVAP System Small Leak Detected - Diagnosis & Repair Guide

Check Engine Light on • Intermittent faint fuel odor near rear wheel well

3 Step DIY GuideTroubleshoot

P0507Medium Severity

Est. DIY: $40 - $250 (DIY Throttle Relearn: $0)

Idle Control System RPM Higher Than Expected - Diagnosis

Engine idles at 1,000+ RPM in park/neutral • RPM surges or hunts at red lights

3 Step DIY GuideTroubleshoot

P0010Moderate Severity

Est. DIY: $120 - $350 (DIY: $40 - $80)

P0010: Camshaft Position Actuator Circuit / Open (Bank 1)

System alert or indicator light illuminated (P0010) • Intermittent performance throttling or unexpected operation halts

5 Step DIY GuideTroubleshoot

P0011High Severity

Est. DIY: $150 - $450 (DIY: $50 - $120)

P0011: Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)

System alert or indicator light illuminated (P0011) • Intermittent performance throttling or unexpected operation halts

5 Step DIY GuideTroubleshoot

P0012High Severity

Est. DIY: $150 - $450 (DIY: $50 - $120)

P0012: Camshaft Position - Timing Over-Retarded (Bank 1)

System alert or indicator light illuminated (P0012) • Intermittent performance throttling or unexpected operation halts

5 Step DIY GuideTroubleshoot

P0013Moderate Severity

Est. DIY: $120 - $320 (DIY: $40 - $75)

P0013: Exhaust Camshaft Position Actuator Circuit / Open (Bank 1)

System alert or indicator light illuminated (P0013) • Intermittent performance throttling or unexpected operation halts

5 Step DIY GuideTroubleshoot

P0014High Severity

Est. DIY: $150 - $420 (DIY: $45 - $90)

P0014: Exhaust Camshaft Position Timing Over-Advanced (Bank 1)

System alert or indicator light illuminated (P0014) • Intermittent performance throttling or unexpected operation halts

5 Step DIY GuideTroubleshoot

P0016Critical Severity

Est. DIY: $300 - $1,200 (DIY: $80 - $250)

P0016: Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)

System alert or indicator light illuminated (P0016) • Intermittent performance throttling or unexpected operation halts

5 Step DIY GuideTroubleshoot

P0017Critical Severity

Est. DIY: $300 - $1,200 (DIY: $80 - $250)

P0017: Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor B)

System alert or indicator light illuminated (P0017) • Intermittent performance throttling or unexpected operation halts

5 Step DIY GuideTroubleshoot

P0100Moderate Severity

Est. DIY: $100 - $300 (DIY: $15 - $80)

P0100: Mass or Volume Air Flow Circuit Malfunction

System alert or indicator light illuminated (P0100) • Intermittent performance throttling or unexpected operation halts

5 Step DIY GuideTroubleshoot

Technical FAQ

Frequently Asked Questions

What are the most common Check Engine fault codes on Cadillac vehicles?

On Cadillac vehicles, the most frequently logged diagnostic trouble codes are P0420 (Catalytic Converter Efficiency), P0300 (Random Misfire), P0171 (System Lean), and P0128 (Coolant Thermostat).

How much does a dealer diagnostic scan cost for a Cadillac?

Standard diagnostic fees at authorized Cadillac dealerships range from $120 to $180, aligned with their $165/hr standard hourly labor rate. Independent auto parts stores can read codes for free.

Can I clear a Cadillac Check Engine light with an OBD-II scanner?

Yes, any standard OBD-II / EOBD scanner connected to the 16-pin DLC port can clear logged DTC codes and turn off the Check Engine light once the underlying mechanical defect has been resolved.