Code
P1026
DACIA
P — Powertrain
Glow plugs, cylinders 4/5/6 - circuit malfunction
Views:
UK: 3
EN: 6
RU: 5
AI status
Completed
Completed
100%
Causes
- One or more glow plugs (cylinders 4/5/6) failed (open, shorted, or high resistance)
- Faulty glow plug relay / glow plug control module
- Blown fuse or poor battery/charging voltage to glow circuit
- Damaged wiring harness or chafed insulation to glow plugs or module
- Corroded/loose connectors at glow plugs or module
- Ground fault or short to chassis
Symptoms
- Hard starting or extended cranking when engine is cold
- White smoke on cold start or rough cold idle
- Glow plug warning lamp or engine management lamp illuminated
- Reduced cold performance; misfires during cold start
- Possible no-crank if severe electrical fault (less common)
What to check
- Read and record freeze-frame and any additional stored DTCs with a scan tool
- Check battery voltage and charging system health
- Inspect fuses related to glow plug circuit
- Visually inspect glow plug wiring, connectors and module for damage or corrosion
- With key on (glow cycle) measure supply voltage at glow plug module and at individual glow plug terminals
- Measure resistance of each glow plug (cold) and compare values between cylinders 4,5,6 and others
Signal parameters
- Battery/supply voltage to glow circuit: ~11–14 V when glow control active
- Individual glow plug resistance (typical pencil-style): low ohms (commonly under a few ohms) — compare between cylinders; large deviation indicates failure
- Module output/current: should show similar current draw per plug when activated (manufacturer-specific values)
- No continuity to ground where not expected; continuity expected through glow plug to its terminal
Diagnostic algorithm
- Connect a diagnostic scanner, read P1026 and any related codes (P067x group), record freeze-frame data.
- Verify battery voltage and inspect/replace any blown fuse protecting the glow circuit.
- Visually inspect wiring and connectors for cylinders 4–6 and the glow plug module; repair any damage or corrosion.
- With ignition off, disconnect each glow plug and measure resistance to identify open or high-resistance plugs; compare values against other cylinders.
- With ignition in glow mode (or using scan tool activation), measure voltage at the glow plug module supply and at each plug terminal to confirm proper activation voltage.
- Test glow plug relay/module operation (activate via scan tool or apply control voltage) and verify output to plugs. Replace module if it fails to switch or shows incorrect outputs.
- Repair or replace faulty glow plug(s), repair wiring/connectors or replace relay/module as indicated by tests.
- Clear codes, perform a functional test and verify no reoccurrence of P1026 and that cold-start behavior returns to normal.
- If fault persists after hardware checks and repairs, consider module control wiring or ECM fault and pursue deeper electrical diagnosis or ECU testing/replacement.
Likely causes
- Individual glow plug(s) for cylinders 4/5/6 have failed (most common)
- Poor connector or corroded terminal at glow plug(s) or module
- Faulty glow plug relay/module
- Wiring harness damage between glow plug module and cylinders
- Supply fuse blown or poor battery voltage
Fault status
Status
Glow plugs circuit malfunction detected for cylinders 4/5/6 — check glow plugs, connectors, wiring, fuse and glow plug relay/module. Further electrical diagnostics required; do not assume final cause without testing.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1026
RAM
P — Powertrain
WOT Circuit Hi
Views:
UK: 5
EN: 9
RU: 7
AI status
Completed
Completed
100%
Causes
- One or more glow plugs (cylinders 4/5/6) failed (open, shorted, or high resistance)
- Faulty glow plug relay / glow plug control module
- Blown fuse or poor battery/charging voltage to glow circuit
- Damaged wiring harness or chafed insulation to glow plugs or module
- Corroded/loose connectors at glow plugs or module
- Ground fault or short to chassis
Symptoms
- Hard starting or extended cranking when engine is cold
- White smoke on cold start or rough cold idle
- Glow plug warning lamp or engine management lamp illuminated
- Reduced cold performance; misfires during cold start
- Possible no-crank if severe electrical fault (less common)
What to check
- Read and record freeze-frame and any additional stored DTCs with a scan tool
- Check battery voltage and charging system health
- Inspect fuses related to glow plug circuit
- Visually inspect glow plug wiring, connectors and module for damage or corrosion
- With key on (glow cycle) measure supply voltage at glow plug module and at individual glow plug terminals
- Measure resistance of each glow plug (cold) and compare values between cylinders 4,5,6 and others
Signal parameters
- Battery/supply voltage to glow circuit: ~11–14 V when glow control active
- Individual glow plug resistance (typical pencil-style): low ohms (commonly under a few ohms) — compare between cylinders; large deviation indicates failure
- Module output/current: should show similar current draw per plug when activated (manufacturer-specific values)
- No continuity to ground where not expected; continuity expected through glow plug to its terminal
Diagnostic algorithm
- Connect a diagnostic scanner, read P1026 and any related codes (P067x group), record freeze-frame data.
- Verify battery voltage and inspect/replace any blown fuse protecting the glow circuit.
- Visually inspect wiring and connectors for cylinders 4–6 and the glow plug module; repair any damage or corrosion.
- With ignition off, disconnect each glow plug and measure resistance to identify open or high-resistance plugs; compare values against other cylinders.
- With ignition in glow mode (or using scan tool activation), measure voltage at the glow plug module supply and at each plug terminal to confirm proper activation voltage.
- Test glow plug relay/module operation (activate via scan tool or apply control voltage) and verify output to plugs. Replace module if it fails to switch or shows incorrect outputs.
- Repair or replace faulty glow plug(s), repair wiring/connectors or replace relay/module as indicated by tests.
- Clear codes, perform a functional test and verify no reoccurrence of P1026 and that cold-start behavior returns to normal.
- If fault persists after hardware checks and repairs, consider module control wiring or ECM fault and pursue deeper electrical diagnosis or ECU testing/replacement.
Likely causes
- Individual glow plug(s) for cylinders 4/5/6 have failed (most common)
- Poor connector or corroded terminal at glow plug(s) or module
- Faulty glow plug relay/module
- Wiring harness damage between glow plug module and cylinders
- Supply fuse blown or poor battery voltage
Fault status
Status
Glow plugs circuit malfunction detected for cylinders 4/5/6 — check glow plugs, connectors, wiring, fuse and glow plug relay/module. Further electrical diagnostics required; do not assume final cause without testing.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1026
RENAULT
P — Powertrain
- Glow plugs, cylinders 4/5/6 - circuit malfunction
Views:
UK: 2
EN: 5
RU: 5
AI status
Completed
Completed
100%
Causes
- One or more glow plugs (cylinders 4/5/6) failed (open, shorted, or high resistance)
- Faulty glow plug relay / glow plug control module
- Blown fuse or poor battery/charging voltage to glow circuit
- Damaged wiring harness or chafed insulation to glow plugs or module
- Corroded/loose connectors at glow plugs or module
- Ground fault or short to chassis
Symptoms
- Hard starting or extended cranking when engine is cold
- White smoke on cold start or rough cold idle
- Glow plug warning lamp or engine management lamp illuminated
- Reduced cold performance; misfires during cold start
- Possible no-crank if severe electrical fault (less common)
What to check
- Read and record freeze-frame and any additional stored DTCs with a scan tool
- Check battery voltage and charging system health
- Inspect fuses related to glow plug circuit
- Visually inspect glow plug wiring, connectors and module for damage or corrosion
- With key on (glow cycle) measure supply voltage at glow plug module and at individual glow plug terminals
- Measure resistance of each glow plug (cold) and compare values between cylinders 4,5,6 and others
Signal parameters
- Battery/supply voltage to glow circuit: ~11–14 V when glow control active
- Individual glow plug resistance (typical pencil-style): low ohms (commonly under a few ohms) — compare between cylinders; large deviation indicates failure
- Module output/current: should show similar current draw per plug when activated (manufacturer-specific values)
- No continuity to ground where not expected; continuity expected through glow plug to its terminal
Diagnostic algorithm
- Connect a diagnostic scanner, read P1026 and any related codes (P067x group), record freeze-frame data.
- Verify battery voltage and inspect/replace any blown fuse protecting the glow circuit.
- Visually inspect wiring and connectors for cylinders 4–6 and the glow plug module; repair any damage or corrosion.
- With ignition off, disconnect each glow plug and measure resistance to identify open or high-resistance plugs; compare values against other cylinders.
- With ignition in glow mode (or using scan tool activation), measure voltage at the glow plug module supply and at each plug terminal to confirm proper activation voltage.
- Test glow plug relay/module operation (activate via scan tool or apply control voltage) and verify output to plugs. Replace module if it fails to switch or shows incorrect outputs.
- Repair or replace faulty glow plug(s), repair wiring/connectors or replace relay/module as indicated by tests.
- Clear codes, perform a functional test and verify no reoccurrence of P1026 and that cold-start behavior returns to normal.
- If fault persists after hardware checks and repairs, consider module control wiring or ECM fault and pursue deeper electrical diagnosis or ECU testing/replacement.
Likely causes
- Individual glow plug(s) for cylinders 4/5/6 have failed (most common)
- Poor connector or corroded terminal at glow plug(s) or module
- Faulty glow plug relay/module
- Wiring harness damage between glow plug module and cylinders
- Supply fuse blown or poor battery voltage
Fault status
Status
Glow plugs circuit malfunction detected for cylinders 4/5/6 — check glow plugs, connectors, wiring, fuse and glow plug relay/module. Further electrical diagnostics required; do not assume final cause without testing.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email